The tin is opened outdoors, usually with more caution than ceremony. Even before the lid has been lifted completely, the first unmistakable aroma escapes into the late-summer air and everyone around the table reacts in their own way.
An experienced guest continues slicing potatoes as though nothing unusual has happened. Someone else laughs, another takes a careful step backwards and a first-time visitor begins to wonder whether agreeing to attend was a serious mistake.
Yet the table itself looks welcoming rather than threatening. Thin Swedish flatbread lies beside bowls of boiled potatoes, chopped onion, sour cream and fresh chives. Butter is ready for spreading, glasses have been filled and the guests are preparing to assemble small sandwiches around the fish.
This is surströmming, Sweden’s famously aromatic fermented herring.
Outside Sweden, it is often presented as an extreme food challenge. Videos focus on swollen tins, dramatic reactions and people attempting to eat the fish directly from the container without understanding how it is traditionally served.
That spectacle has made surströmming internationally famous, but it has also hidden much of the real story.
Surströmming is not normally eaten alone, straight from the tin, by someone trying to prove their courage. It belongs to a complete late-summer meal shaped by preservation, regional identity and social tradition. The fish is combined with mild potatoes, bread, butter and onion, which soften its intensity and place it within a familiar northern Swedish food culture.
For those who grew up with it, the smell can be connected with family gatherings, warm August evenings and tables prepared outdoors. For others, including many Swedes, the same smell is enough to keep them at a respectful distance.
Few Swedish foods divide opinion so completely.
What Exactly Is Surströmming?
Surströmming is Baltic herring that has been lightly salted and allowed to ferment.
The fish is traditionally caught during spring, when the herring is approaching its spawning season. It is cleaned and placed in brine before being transferred to barrels containing a weaker salt solution, where the fermentation develops over several weeks.
The fish is later packed into sealed tins, but the process does not stop completely when the lid is closed. Fermentation continues slowly inside the container, producing gases and creating the pressure for which surströmming tins are known.
This is why an unopened tin can sometimes appear rounded or swollen rather than perfectly flat.
That appearance may look alarming to someone accustomed to treating every bulging food container as spoiled. With traditionally produced surströmming, a degree of pressure is connected with the ongoing fermentation, although damaged or leaking tins should never be treated casually.
The finished fish is soft, salty, sour and deeply savoury. Its flavour is strong, but usually less aggressive than the smell surrounding the opened tin suggests.
Surströmming is therefore not one isolated taste. The experience includes the aroma, texture, accompaniments, setting and reactions of everyone sharing the table.
What Does the Word Surströmming Mean?
The name is formed from two Swedish words.
Sur means sour, while strömming is the Swedish name commonly used for herring caught in the Baltic Sea north of a traditional geographical boundary.
The direct translation is therefore sour Baltic herring or fermented Baltic herring.
The word sur does not mean that the fish has become accidentally spoiled. It refers to the acidic character produced during fermentation, much as sourness appears in cultured dairy products, fermented vegetables and other preserved foods.
In everyday Swedish, the name also carries a cultural meaning beyond its ingredients. Surströmming immediately suggests late summer, northern Sweden, tins opened outdoors and a table surrounded by people who either love the tradition or have agreed to tolerate it for the sake of the company.
A person may have strong opinions about surströmming without having tasted it.
The name alone is enough to begin an argument.
Is Surströmming Rotten Fish?
No. Surströmming is fermented, not rotten.
The difference is important because fermentation is a controlled process in which microorganisms and natural enzymes transform food under managed conditions. Salt, time, temperature and handling help create an environment in which the desired changes can take place.
Rotting is uncontrolled decomposition. It produces an unsafe and unpredictable product that should not be eaten.
Surströmming has an extremely powerful smell because the fermentation creates several pungent compounds. These aromas can remind people of sulphur, strong cheese, sour dairy products, aged seafood and other scents rarely encountered together.
The smell is therefore not evidence that the fish was forgotten somewhere until it became inedible.
It is part of the intended result.
This distinction is easily lost in international descriptions, where phrases such as “rotten herring” are more dramatic and therefore more likely to attract attention.
Calling surströmming rotten may make a better headline.
It does not describe the food accurately.
Why Does Surströmming Smell So Strong?
Fermentation changes the fish chemically and produces volatile compounds that become especially noticeable when the tin is opened.
Inside the sealed container, the aroma remains concentrated. Once the lid is broken, the released gases and surrounding liquid carry the smell quickly into the air.
This first moment is often more intense than the actual experience of eating the fish. The concentrated aroma reaches everyone at once, while the flavour is later divided between small pieces of fish, bread, potatoes and other accompaniments.
Temperature also matters. A cold tin generally releases its aroma less aggressively than one that has become warm, which is one reason surströmming should remain properly refrigerated before serving.
The surroundings make a difference as well. Indoors, the smell can remain in curtains, furniture and rooms long after the meal has ended. Outdoors, air movement allows it to disperse far more quickly.
This practical reality helped establish one of the most familiar rules of surströmming:
Open it outside.
What Does Surströmming Actually Taste Like?
The smell is so famous that descriptions of the flavour often become secondary.
People tasting surströmming for the first time may expect the fish itself to be almost impossibly strong. The reality is more complicated. It is intensely salty and savoury, with clear acidity, a soft texture and a deep fermented character.
The flavour can be rich and rounded, although individual producers, tins and fish naturally vary.
It is rarely intended to be eaten in large bites by itself. A small amount of fish is combined with mild ingredients that provide balance.
Boiled potato softens the saltiness. Bread adds structure, butter adds richness and chopped onion brings freshness and sharpness. Sour cream can make the mixture gentler, while chives add a green, familiar note.
The resulting bite still tastes unmistakably of surströmming, but it is no longer only fermented fish. It becomes part of a layered meal in which each ingredient has a purpose.
This is the context missing from many online challenges. Someone who removes a whole fish from the tin and eats it without preparation is not demonstrating the traditional Swedish way of enjoying surströmming.
They are creating the most difficult possible version of the experience.
Why Do Swedes Call It Strömming Rather Than Sill?
Swedish uses two familiar names for the same species of Atlantic herring: sill and strömming.
The distinction traditionally depends on where the fish is caught. Herring from the Baltic Sea north of a historical boundary is generally called strömming, while fish caught farther south and on Sweden’s west coast is usually called sill.
The biological species may be the same, but geography, fishing traditions and local food culture shape the name.
Surströmming is made from the smaller Baltic herring associated with Sweden’s eastern and northern coastal waters. Calling it sursill would therefore sound culturally and geographically wrong, even though an English speaker might translate both sill and strömming simply as herring.
The word connects the food directly to the Baltic coast.
It identifies not only the fish but the landscape and communities from which the tradition developed.
A Food Born From Preservation
Surströmming belongs to a much older world in which food preservation was essential to survival.
Before refrigeration, coastal communities needed ways to keep fish available after the catch had ended. Drying, smoking, salting and fermenting allowed seasonal food to last through periods when fresh supplies were uncertain.
Salt was valuable, and fully preserving fish through heavy salting required considerable quantities. Fermentation offered a method that could work with less salt than some other preservation techniques.
The fish was placed in brine and allowed to sour under controlled conditions. The process changed its flavour and texture while extending the period during which it could be stored and transported.
This was not originally an eccentric food created to shock outsiders.
It was practical everyday food.
Farmers, fishermen, labourers and coastal households ate preserved fish because it provided nourishment when fresh alternatives were limited. Bread and potatoes made the meal filling, while the fermented fish supplied salt and strong flavour in relatively small amounts.
The reputation of surströmming as a daring delicacy came much later.
Its origins were shaped by economy, season and necessity.
How Old Is the Surströmming Tradition?
Surströmming is documented in Sweden from at least the sixteenth century, when fermented herring was already being produced and traded.
The method may be older, because fermentation rarely begins with one inventor or a clearly recorded date. It develops gradually through practical knowledge passed between fishing communities and households.
People learned how much salt was required, how long the fish needed to remain in barrels and how temperature affected the result. Success depended on experience rather than laboratory measurements.
The technique became especially valuable in northern coastal regions, where the spring herring catch could be preserved for later use.
As trade improved, surströmming began travelling beyond the places where it was produced. Wooden barrels and smaller containers carried the fish inland and southward, although transport was more difficult before modern packaging.
What began as regional preserved food gradually became known throughout Sweden.
That did not mean everyone began eating it.
Its identity remained strongly northern even as its reputation spread nationally.
Was Surströmming Invented Because Sweden Ran Out of Salt?
A popular story claims that surströmming was created during a sixteenth-century salt shortage, sometimes connected with war or disrupted trade.
There is a reasonable historical connection between limited salt and the use of fermentation. Salt was expensive, and methods requiring smaller quantities would have been economically valuable.
However, food traditions rarely appear as the result of one dramatic shortage or one accidental discovery. Fermenting fish was already part of a broader northern European preservation culture, and people had long understood that carefully salted fish could continue changing without simply becoming waste.
It is therefore more accurate to see salt scarcity as one factor that encouraged and strengthened the method rather than treating it as a single proven moment of invention.
The familiar story survives because it is easy to remember: people used too little salt, the fish fermented and surströmming was born.
The real history is less dramatic but more interesting. Generations of coastal families refined a practical preservation method until it became a distinctive regional food.
From Everyday Food to Cultural Tradition
For much of its history, surströmming was not a luxury.
It belonged to the ordinary diet of communities where preserved fish, flatbread and potatoes were familiar household foods. The ingredients were practical, transportable and suitable for a climate in which the growing and fishing seasons had to provide for the rest of the year.
The fish could be eaten during agricultural work, carried to distant places or served when fresh meat and fish were unavailable.
Over time, economic conditions changed. Refrigeration, improved transport and modern supermarkets removed the original necessity of preserving spring-caught fish through fermentation.
Surströmming did not disappear.
Instead, its meaning changed.
A food once eaten because it was practical became something eaten because it represented heritage, family memory and a particular season. The annual gathering became more important than the need for preservation.
This transformation has happened to many traditional foods. When necessity fades, ritual can keep the flavour alive.
Northern Sweden and the High Coast
Surströmming is closely associated with the northern Swedish coast, particularly the High Coast and the islands around Ulvön.
The region’s fishing communities developed strong knowledge of catching, processing and preserving Baltic herring. Surströmming production became part of the local economy, and certain places gained reputations for the quality of their fish.
Ulvön is often described as one of the tradition’s most important centres. Fishing families worked seasonally, processing large catches and developing methods that passed between generations.
The surrounding landscape helps explain the food’s identity. The High Coast is shaped by steep wooded shores, islands, fishing harbours and villages facing the Gulf of Bothnia. Sea, forest and farmland have always influenced what people could produce and preserve.
Tunnbröd, potatoes and fermented fish formed a meal suited to this environment. None of the ingredients was extravagant, but together they created something sustaining and strongly regional.
Today, surströmming is eaten in many parts of Sweden, but the connection with the northern coast remains central.
A tin opened far from the sea still carries that regional story with it.
Ulvön and the Fishing Communities
The Ulvön islands became especially famous for surströmming production during the nineteenth and twentieth centuries.
Families travelled to fishing settlements during the spring season, when herring moved through the surrounding waters. The catch had to be handled quickly, sorted and preserved while conditions were favourable.
Production required physical labour and close attention. Fish were cleaned, salted and placed into barrels, where the fermentation developed before the product could be packed and transported.
Knowledge was practical and often family-based. People understood the process through smell, texture, appearance and experience.
The work also connected isolated coastal settlements with a wider market. Surströmming travelled from small northern communities to shops and households elsewhere in the country.
Improved packaging eventually made that distribution easier. The transition from wooden containers and stoneware vessels to sealed metal tins allowed the fish to move farther while continuing to mature.
The tin that now appears in supermarket refrigerators is therefore the modern end of a much older coastal production system.
How Surströmming Is Made
Traditional production begins with Baltic herring caught during spring, often before spawning.
The fish are sorted, rinsed and placed in a stronger salt solution. This first stage helps remove blood and prepares them for fermentation.
They are then gilled and partly cleaned without being opened in the same way as an ordinary filleted fish. The exact preparation varies by product, but the internal handling is designed to support the traditional process.
The fish are transferred to barrels with a weaker brine, where fermentation continues for several weeks. Temperature, salt concentration, fish quality and timing all influence the finished result.
A producer must allow enough fermentation to develop the characteristic texture and flavour without losing control of the process.
Once the fish has reached the appropriate stage, it is packed into sealed tins or other containers. The fermentation continues more slowly during storage, which is why the product remains refrigerated.
The simplicity of the ingredient list can be surprising.
At its most traditional, surströmming requires little more than herring, water, salt and time.
The complexity comes from what happens between them.
The Role of Salt
Salt performs several functions during surströmming production.
It draws moisture from the fish, influences which microorganisms can develop and helps create conditions in which the intended fermentation can proceed.
Too little salt could make the process unsafe or unstable. Too much would prevent the characteristic fermentation and produce something closer to heavily salted preserved fish.
Finding the correct balance was historically part of the producer’s skill.
The saltiness remains clear in the final food, which is one reason surströmming is served in relatively small quantities with unsalted or mildly seasoned accompaniments.
Potatoes, flatbread and dairy products do not merely decorate the plate. They spread the salt and acidity across a larger, gentler bite.
A person eating the fish directly from the tin experiences a concentration that the traditional meal was never designed to provide.
Fermentation Inside the Barrel
During the barrel stage, microorganisms and natural enzymes begin transforming the fish.
Proteins and other components break down, creating the soft texture, acidity and aromatic compounds associated with mature surströmming.
The process requires patience. Fish packed too early will not have developed properly, while a poorly controlled batch can produce inconsistent results.
Historically, producers relied heavily on sensory knowledge. They judged the fish through appearance, feel and smell, supported by habits developed through repeated seasons.
Modern producers combine traditional experience with controlled food-production methods, refrigeration and documented hygiene procedures.
The goal remains recognisable: the fish should be tender, salty and fermented, with a full flavour considered desirable by those who know the product.
The smell may dominate public discussion.
For the producer, maturity, consistency and taste matter just as much.
Why Surströmming Is Packed in Tins
Metal tins transformed how surströmming could be stored and sold.
Earlier packaging included wooden barrels, smaller wooden containers and stoneware vessels. These methods worked locally but created limits for transport, portioning and retail.
The sealed tin made it possible to distribute surströmming more widely and sell it in convenient household quantities.
It also allowed the fermentation to continue slowly after packaging.
That continuing activity separates the tin from most ordinary canned foods. A standard canned product is generally heat-treated to stop microbial activity and create long shelf life at room temperature.
Surströmming is a refrigerated fermented product. It remains active enough to produce gases, which increase the internal pressure and gradually change the appearance of the container.
The tin is therefore not merely packaging.
It becomes the final small chamber in which the fish continues to mature.
Why Are Surströmming Tins Swollen?
The fermentation produces gases that accumulate inside the sealed container.
As pressure increases, the top and bottom of the tin may become rounded. This characteristic shape has become one of the most recognisable visual signs of surströmming.
To someone unfamiliar with the product, the tin can look ready to explode. In ordinary handling, it is not a dramatic bomb, but the pressure means it must be opened carefully.
The contents can spray when the seal is broken, particularly if the tin is warm or has been shaken. This is another reason experienced diners keep it cold and open it in a controlled way.
The swollen tin also helped create the food’s online mythology. It looks dangerous before anyone has smelled or tasted what is inside.
Traditional diners see something more ordinary: a container holding a living fermented product that needs to be treated with respect.
A tin that is leaking, damaged or improperly stored should not be confused with normal fermentation pressure.
Tradition does not replace basic food safety.
The Creation of the Surströmming Premiere
Today, the surströmming season is traditionally associated with the third Thursday of August.
This fixed premiere dates from 1940, when concerns arose that competition and increasing demand were encouraging some sellers to release fish before it had fermented properly.
Establishing an official opening date helped protect quality by ensuring that the spring catch had enough time to mature before reaching customers.
The premiere did not create the food or the August eating season. It formalised a rhythm already shaped by the spring catch and the weeks required for fermentation.
For decades, the date gave surströmming something resembling a seasonal launch. Newspapers reported on the year’s supply, shops prepared their tins and enthusiasts arranged their gatherings.
The legal rules surrounding the official sales date later changed, but the third Thursday of August remains culturally important.
It marks the moment when the season feels ready to begin.
Why the Tradition Belongs to Late Summer
Surströmming could technically be eaten at other times when tins are available, but late summer gives the tradition its strongest setting.
The fish caught in spring has had time to mature. New potatoes remain available, onions and chives are fresh and evenings are still warm enough for long outdoor meals.
August also carries a particular Swedish mood. The brightest weeks of summer have passed, but autumn has not yet arrived fully. Families have returned from holidays, nights are becoming darker and people gather for one of the final outdoor meals of the season.
A surströmmingsskiva fits naturally into that transition.
The food itself comes from preservation, but the occasion celebrates what is still fresh: potatoes, herbs, conversation and the remaining warmth of the year.
The strong smell also provides an excellent reason to remain outside.
Practicality and atmosphere happen to agree.
Why Many Swedes Have Never Eaten Surströmming
International coverage sometimes presents surströmming as though it were a routine national food eaten regularly in every Swedish home.
It is not.
The tradition is strongest in northern Sweden and among families with a direct connection to the food. In other regions, people may know everything about its reputation while never having opened a tin themselves.
Some Swedes dislike the smell, others dislike fermented fish and many simply did not grow up in households where surströmming was served.
The dish can therefore feel both deeply Swedish and unfamiliar to a large part of the Swedish population.
This contradiction is part of its cultural importance.
National identity is rarely built only from things everyone does. It also includes regional customs that become widely recognised, discussed and sometimes exaggerated.
Almost every Swede knows what surströmming is.
Far fewer can agree on whether it should be eaten.
A Tradition Divided Between Love and Disgust
Surströmming leaves little room for polite indifference.
Those who enjoy it often defend the food passionately. They describe a rich, salty flavour that becomes balanced and satisfying when eaten properly with the traditional accompaniments.
Those who dislike it may find the first aroma so overwhelming that tasting becomes almost impossible.
Family history plays an important role. A person who first encountered surströmming at a relaxed gathering among experienced relatives is likely to understand the meal very differently from someone introduced through an internet challenge.
Memory can also transform the aroma. What appears unbearable to an outsider may remind another person of grandparents, a summer cottage or annual gatherings beside the sea.
This does not mean that every person with northern Swedish roots loves surströmming.
Traditions remain alive partly because people argue about them.
A table containing one open tin can produce affection, jokes, complaints and old family stories before anyone has finished preparing the first sandwich.
From Preserved Fish to International Spectacle
For centuries, surströmming was regional food with limited importance outside Sweden.
The internet changed that.
Videos showing people opening tins indoors, smelling the concentrated contents and attempting to swallow whole fish spread around the world. Surströmming became known as one of the planet’s most challenging foods.
The exaggerated approach suited online entertainment. Strong reactions were more valuable than cultural understanding, and the traditional accompaniments often disappeared because they made the experience less dramatic.
The result created enormous curiosity but a distorted picture of the meal.
A Swedish surströmmingsskiva is not normally a punishment. Guests are not expected to become ill, and experienced diners do not treat the fish as something to survive.
The humour surrounding the smell is real. So is the possibility that a first-time guest may decide never to taste it again.
But beneath the jokes is a genuine food tradition shaped by coastal labour, fermentation knowledge and generations of shared late-summer meals.
To understand surströmming, the tin must be placed back on the table rather than held in front of a camera as a dare.
More Than Sweden’s Smelliest Food
The smell cannot be removed from the story of surströmming, nor should it be. It is powerful, unusual and central to the experience.
It should not be allowed to become the entire story.
Surströmming reflects a time when coastal households had to preserve the spring catch for later months. It carries the knowledge of fishermen and producers who learned to control a difficult fermentation process without modern equipment.
It is connected with northern landscapes, Baltic herring, flatbread traditions and the short Swedish summer.
The tin contains only a small amount of fish.
Around it has grown a much larger tradition involving anticipation, preparation, regional pride and the question asked at almost every gathering:
Who is willing to open it?
What Is a Surströmmingsskiva?
A surströmmingsskiva is a gathering built around eating surströmming together, usually during late summer.
The word skiva can describe a party or social occasion, much as it does in kräftskiva, Sweden’s traditional crayfish party. A surströmmingsskiva is generally less decorated and more strongly connected with the meal itself, but the atmosphere can be equally relaxed and communal.
The gathering often takes place outdoors at a summer cottage, in a garden, beside a red wooden house or near the northern coast. A long table is prepared with flatbread, boiled potatoes, butter, chopped onion, sour cream and chives before the tin is opened.
Experienced guests may begin arranging their ingredients immediately, while newcomers watch carefully and wait for instructions.
The moment the tin is opened becomes part of the occasion. People lean away, laugh, comment on the year’s aroma and remember previous gatherings. Someone may claim that the current tin is unusually mild, while another insists that it is stronger than ever.
The meal is therefore social before anyone has taken the first bite.
Surströmming is difficult to eat casually or anonymously. Its smell announces the gathering to everyone nearby, and the preparation naturally encourages people to build their sandwiches together.
The food creates conversation because it is impossible to ignore.
Why Surströmming Is Usually Eaten Outdoors
Opening surströmming outdoors is not only a playful tradition.
It is practical.
The concentrated aroma released from the tin can remain indoors for a long time. Curtains, upholstered furniture and other soft materials may hold the smell after the table has been cleared.
Outside, wind and open space allow the aroma to disperse more quickly.
A garden, veranda or simple table beside a summer cottage therefore provides a much better setting than a small apartment kitchen.
The outdoor location also suits the time of year. Surströmming season begins while the evenings are still relatively mild, and many families are eager to make use of the final weeks of summer.
The table may remain outside as daylight fades and the air becomes cooler. Sweaters are pulled on, candles are lit and the meal continues long after the tin itself has been emptied.
In this setting, the smell becomes only one part of the evening rather than taking over the entire home.
How to Prepare for a Surströmmingsskiva
A successful surströmmingsskiva begins before the tin is opened.
The fish should remain properly refrigerated and be kept cold until shortly before serving. A cold tin is easier to handle and generally releases its aroma less aggressively than one that has been allowed to become warm.
The traditional accompaniments should already be prepared and placed on the table. Potatoes are boiled, onions chopped and chives cut finely. Flatbread, butter, sour cream and serving utensils are arranged so that no one has to carry the open tin through the house afterward.
Plates, glasses, napkins and a container for fish bones should also be ready.
Some hosts place the tin in a bowl or shallow tray before opening it so that the brine remains contained. Others bring a bucket of water outdoors and open the tin partly beneath the surface.
The preparation may appear excessive for one small container of fish.
Once the seal is broken, however, most guests understand why everything else was organised first.
How Should You Open a Tin of Surströmming?
The safest approach is calm, controlled and outdoors.
The tin should be cold and should not be shaken. It can be placed upright in a bowl, tray or bucket so that any escaping liquid remains contained.
Some people pierce the top carefully while the tin is partly submerged in water. The water reduces spraying and can soften the first concentrated release of aroma.
Others use a can opener while holding a cloth or paper towel nearby.
The lid should be opened gradually rather than removed in one sudden movement. Pressure inside the tin may cause brine to rise or spray through the first opening.
Once the pressure has escaped, the lid can be removed more easily.
The water method is useful, but it should not become a theatrical performance. The goal is simply to keep the liquid under control and prevent it from landing on clothing, furniture or nearby guests.
Opening the tin correctly does not eliminate the smell.
It makes the moment far less chaotic.
Why Some People Open the Tin Underwater
The practice of opening surströmming underwater has become almost as famous as the fish itself.
A tin is placed in a bucket or large bowl of water, and the first hole is made while the top remains below the surface. The water catches brine and gas as the pressure is released.
This can reduce the sudden spray that sometimes occurs when a swollen tin is opened directly in the air.
It may also make the first moment slightly gentler, although the aroma will still become noticeable once the tin and fish are lifted from the water.
Not every experienced surströmming eater uses this method. A cold tin opened carefully outdoors can be handled without a bucket.
The underwater approach is especially useful for beginners who are uncertain about the pressure or who want additional protection against splashing.
It should never be treated as permission to open the tin indoors.
Water controls the liquid.
It does not make the smell disappear.
Whole Fish or Fillets?
Surströmming is sold in different forms.
Some tins contain whole fish or fish that still require cleaning before serving. Others contain prepared fillets that are easier for beginners to handle.
Whole surströmming preserves more of the traditional process and is preferred by many experienced diners. The fish is opened, the bones removed and the flesh separated before being placed on the bread.
This requires more work and familiarity.
Fillets provide a simpler introduction. They can be divided into small pieces and added directly to the meal without requiring each guest to clean an entire fish.
The difference can influence the texture and overall experience, but both forms belong to the tradition.
A first-time guest does not need to prove anything by choosing the most difficult version.
The aim is to understand the flavours and social meal, not to turn dinner into a test of endurance.
How to Clean a Whole Surströmming
A whole fish is placed on a plate or board and opened carefully along the underside.
The remaining internal parts are removed, and the fish is unfolded so that the central backbone can be lifted away. Smaller bones may remain and should be checked before the flesh is divided.
The fish is soft after fermentation, so the process requires gentle handling. Pulling too quickly can break the flesh into small pieces or spread liquid across the plate.
Experienced diners may clean the fish with little hesitation, having watched relatives do the same for years.
For someone unfamiliar with the process, guidance from another guest can be helpful.
The cleaned flesh is normally divided into relatively small portions.
One whole fish can contribute to several sandwiches because surströmming is used as the strong central flavour rather than the largest ingredient on the plate.
What Is Served With Surströmming?
The traditional accompaniments are mild, practical and carefully balanced.
They commonly include:
Tunnbröd, either soft or crisp.
Boiled potatoes, often small new potatoes.
Butter.
Finely chopped yellow or red onion.
Sour cream or crème fraîche.
Fresh chives.
Some households add tomatoes, dill or other simple ingredients, although the classic meal remains relatively restrained.
The purpose is not to hide the fish completely. It is to soften and distribute its saltiness, acidity and powerful aroma.
A small amount of surströmming becomes part of a much larger bite containing bread, potatoes and dairy.
Without these accompaniments, the fish can feel overwhelmingly concentrated.
With them, the flavours become more rounded and recognisable as a complete meal.
The Importance of Tunnbröd
Thin Swedish flatbread is one of the essential parts of the surströmming table.
In northern Sweden, tunnbröd has long been valued because it can be stored, transported and served with many different foods. It suits a region where baking traditions developed around seasonal ovens and the need to preserve bread for long periods.
Both soft and crisp tunnbröd may be used.
Soft bread can be folded or rolled around the filling, creating a compact sandwich known as a klämma. Crisp flatbread provides a firmer base and a stronger contrast with the soft fish and potatoes.
The bread also makes surströmming easier to portion.
A small piece of fish can be spread across a wider surface and combined evenly with potato, onion and sour cream.
What might otherwise feel like an intense mouthful becomes a layered northern Swedish sandwich.
What Is a Surströmmingsklämma?
A surströmmingsklämma is a folded flatbread sandwich filled with surströmming and its traditional accompaniments.
The word klämma comes from the idea of pressing or folding the bread around the filling.
A typical version begins with soft tunnbröd spread with butter. Sliced or crushed boiled potatoes are added, followed by small pieces of cleaned surströmming, chopped onion, sour cream and chives.
The bread is then folded into a manageable shape.
There is no universal formula. Families develop their own preferred proportions, and arguments can arise over whether the potato should be sliced, crushed or left in larger pieces.
Some use generous sour cream, while others believe too much weakens the character of the fish. One household prefers red onion, another insists on yellow.
These differences are part of the tradition.
The klämma turns a famously difficult ingredient into something practical enough to hold in one hand.
How to Build a Traditional Surströmming Sandwich
The most important rule is not to begin with too much fish.
A layer of butter is spread across the tunnbröd, followed by potato. The potato creates a mild foundation and prevents the surströmming from dominating every other flavour.
A small quantity of fish is then added.
Finely chopped onion provides freshness and texture, while sour cream softens the saltiness and acidity. Chives bring colour and a mild onion flavour that suits the rest of the filling.
The bread can be folded, rolled or eaten open-faced depending on its type and the family custom.
A first sandwich should remain modest. More fish can always be added to the next one.
Beginning with a large piece directly from the tin can make the entire experience unnecessarily difficult.
Surströmming is best understood through balance rather than bravery.
The Role of Potatoes
Potatoes are more than a convenient side dish.
They are one of the ingredients that make the meal work.
Their mild flavour absorbs the salt and acidity of the fish, while their soft texture blends naturally with the tunnbröd and sour cream.
Small new potatoes are particularly associated with the late-summer meal. They carry the freshness of the season and provide a contrast with a fish preserved through fermentation.
Some guests slice the potatoes carefully. Others crush them directly onto the bread with a fork.
The difference may seem minor, but family food traditions often attach great importance to such details.
A surströmming table can tolerate disagreement over the smell.
The handling of the potatoes may produce an equally serious discussion.
Onion, Sour Cream and Chives
Chopped onion adds sharpness and crunch to the otherwise soft meal.
Yellow onion is traditional in many households, while red onion offers a milder flavour and stronger colour. The pieces are usually chopped finely so that they spread evenly through the sandwich.
Sour cream provides richness and coolness. It does not remove the taste of surströmming, but it makes the salt and acidity less concentrated.
Chives add a familiar garden flavour and are often scattered generously across the finished sandwich.
Together, these ingredients create contrast.
The fish is soft, salty and fermented. The onion is crisp and fresh. The dairy is cool and mild, while the herbs connect the meal with the late-summer garden.
None of the accompaniments is especially complicated.
Their success comes from how carefully they support one another.
Why the Meal Is Not Supposed to Be a Challenge
A traditional surströmmingsskiva is built for enjoyment, not humiliation.
The portions are small, the accompaniments are generous and experienced diners help newcomers understand what to do.
People may laugh at strong reactions, but the goal is not to make someone ill or pressure them into eating more than they can tolerate.
The challenge format popular online removes nearly everything that makes the meal balanced. The tin is often opened indoors or held close to the face. The fish is eaten directly, sometimes with skin, bones and brine, while bread and potatoes are treated as unnecessary.
This creates maximum discomfort and minimum understanding.
A genuine first taste should be a small piece in a properly prepared klämma, eaten outdoors among people who know the tradition.
The visitor may still dislike it.
At least they will have tasted surströmming as food rather than as a stunt.
What Do People Drink With Surströmming?
Beer is a common accompaniment, especially lighter lager styles that can refresh the palate without competing heavily with the food.
Some gatherings also include snaps, served in small glasses and accompanied by songs or toasts. This creates a connection with other Swedish festive meals, although surströmming does not require alcohol to be traditional.
Water and non-alcoholic drinks should also be available.
The fish is very salty, and the meal can create considerable thirst. Sweet soft drinks may appeal to some guests, while others prefer sparkling water or a mild non-alcoholic beer.
The strongest drinks are not necessarily the best partners. Surströmming already carries enormous intensity.
The drink usually works best when it refreshes rather than attempts to overpower the fish.
Snapsvisor and Late-Summer Singing
Some surströmmingsskivor include snapsvisor, the short drinking songs associated with Swedish festive meals.
The songs may be familiar from midsummer, crayfish parties and Christmas gatherings. They are sung before a small drink, often with more enthusiasm than musical skill.
Not every gathering includes singing, and the tradition varies between families.
Where it does appear, it adds another layer of shared ritual. Guests who know the words begin immediately, while others follow the melody or join only for the final line.
The songs help transform the meal from a simple dinner into an annual occasion.
They also provide a useful pause between sandwiches.
Surströmming is eaten slowly, and the table rarely needs encouragement to become loud.
The Smell Versus the Flavour
One of the greatest obstacles for first-time diners is separating aroma from taste.
Smell strongly influences flavour, and surströmming announces itself long before the sandwich reaches the mouth. A person who has already decided that the aroma is unbearable may find it difficult to experience anything else.
The accompaniments change that relationship.
Once the fish is combined with bread, potato, onion and sour cream, its flavour becomes less isolated. Salt, acidity, dairy richness and fresh onion arrive together.
Some people are surprised to discover that the taste is far more approachable than expected.
Others find that no amount of potato can overcome the aroma.
Both reactions are genuine.
The important point is that the smell and flavour are not identical. The first can dominate an entire garden, while the second occupies only a small part of a carefully assembled bite.
Does Surströmming Taste Different Between Producers?
Yes.
Although the basic method is shared, producers develop different results through their choice of fish, salt concentration, fermentation time, packing method and maturation.
Some products are considered milder, while others have a stronger acidity or softer texture. The amount of brine, size of the fish and balance of salt may also vary.
Experienced enthusiasts often have favourite brands and can discuss the differences with the seriousness normally reserved for cheese, wine or cured meats.
The year’s catch may influence expectations as well. Fish size, condition and availability can affect production before fermentation has even begun.
To outsiders, every tin may appear equally extreme.
To regular diners, the differences are meaningful enough to shape the entire gathering.
Family Traditions and Private Rules
Surströmming is surrounded by family-specific habits.
One household always opens the tin in a bucket. Another considers that unnecessary.
One family serves only soft tunnbröd, while another insists that crisp bread provides the correct texture. Some use red onion, others yellow. Sour cream may be essential in one home and almost absent in another.
The person responsible for cleaning the fish may be the same relative every year. Someone else always boils the potatoes or brings the drinks.
These repeated roles create continuity.
A guest may remember the gathering less through the exact flavour than through the person who opened the tin, the jokes made before the first bite and the familiar argument over how much onion belongs on the bread.
The meal survives because it is repeated.
Each family repetition makes it slightly different.
Children and Their First Surströmming
Children raised in surströmming-eating families often encounter the tradition gradually.
They may begin by eating tunnbröd with potatoes, butter and onion while avoiding the fish entirely. Later, a tiny piece is added to one corner of the sandwich.
Some children accept the flavour quickly because the smell and gathering already feel familiar. Others refuse it for years and eventually taste it as adults.
There is rarely a need to force the experience.
Surströmming is strongly connected with memory, and an unpleasant first encounter can shape a person’s opinion permanently.
A child who watches grandparents enjoy the meal may become curious in time.
The tradition is passed down not only through eating but through witnessing the preparation, helping with the table and understanding why the gathering matters.
Can You Eat Surströmming Indoors?
It is possible, but generally unwise.
Restaurants and specialised locations may have ventilation or designated areas, but an ordinary home can hold the aroma long after the meal.
Opening the tin indoors creates the greatest problem because the first concentrated release can spread quickly through nearby rooms.
Even carrying opened fish through the house may leave traces.
A balcony may seem like a compromise, but neighbours living above, below or beside it may not appreciate the decision.
The best setting remains a genuinely open outdoor space where the smell can disperse without entering someone else’s home.
Surströmming is a tradition built around consideration as much as tolerance.
The guests may have agreed to the meal.
The entire neighbourhood has not.
How Should Leftovers Be Handled?
Unused fish and brine should be sealed carefully before disposal or storage.
Leaving an open tin outside may attract animals and spread the smell far beyond the table.
Leftovers intended for later use should remain properly refrigerated in a sealed container. The original tin is not always the easiest container to close securely once opened, so a tightly sealed separate container may be more practical.
Fish bones, onion scraps and used paper should be gathered promptly. The table, utensils and opening tray should be washed before the aroma settles.
The water used for opening the tin should not be poured beside the dining area or near a neighbour’s property.
A good surströmmingsskiva ends with the same planning that began it.
The meal is traditional.
Leaving the smell behind for someone else is not.
How Should an Unopened Tin Be Stored?
Surströmming should remain refrigerated.
Unlike ordinary sterilised canned food, the product continues to mature inside the tin. Warm storage can accelerate fermentation, increase pressure and affect quality.
The packaging should be handled carefully and checked for leaks or damage.
A rounded tin can be normal for surströmming because of fermentation gases. A container that is leaking, badly damaged or stored incorrectly requires greater caution.
The product should also be eaten within the recommended period provided by the producer.
The traditional image of a dramatically swollen tin can make surströmming seem indestructible.
It is still perishable food and should be treated accordingly.
Can Surströmming Be Transported?
Transporting surströmming requires planning because the tin must remain cold and protected from damage.
The pressure inside the container and the consequences of a leak make casual packing a poor idea. A tin placed loosely among clothing or household items could create an unforgettable problem if punctured.
Rules for commercial transport, air travel and individual carriers can differ, so travellers need to check the current requirements before attempting to bring surströmming on a journey.
Even where it is allowed, the tin should be sealed inside protective packaging and kept appropriately refrigerated.
The cultural value of bringing surströmming to friends abroad is understandable.
So is the concern of anyone responsible for transporting it.
Surströmming in Restaurants and Public Events
Most surströmming is eaten at private gatherings, but restaurants, museums, food festivals and cultural organisations sometimes arrange public tastings.
These events can provide a good introduction because the fish is served correctly and someone is available to explain the preparation.
The setting may also reduce anxiety. A first-time guest does not need to buy an entire tin, clean the fish or convince friends to tolerate the smell.
Public events are especially common in regions connected with the tradition, where surströmming is treated as cultural heritage rather than an exotic challenge.
The experience may include stories about fishing, production and local families alongside the meal.
This wider context changes the meaning of the first bite.
The visitor is not simply tasting something famous for smelling strong.
They are tasting part of a northern coastal history.
The Annual Debate About Supply
Surströmming season is sometimes accompanied by concern about whether enough tins will be available.
The Baltic herring catch is influenced by environmental conditions, fishing regulations, fish populations and the economics of small-scale production.
When supply is limited, tins can disappear quickly from shops, particularly in regions where the tradition remains strongest.
Enthusiasts may purchase their preferred products as soon as the season begins. News about shortages can create additional demand, even among people who might otherwise have waited.
This uncertainty adds to the seasonal feeling.
Surströmming is not always available in unlimited quantities throughout every supermarket.
The opening of the season can still carry a sense of anticipation because no one is certain exactly what the year will bring.
A Regional Tradition Known Around the World
Few regional Swedish foods have achieved such international recognition.
People who cannot locate the High Coast on a map may still know that Sweden produces a famously pungent fish in swollen tins.
This global fame is both useful and misleading.
It attracts visitors, supports curiosity and keeps the name alive. It can also reduce centuries of food history to a single dramatic reaction.
The real tradition is quieter than the internet version.
It involves boiled potatoes, old family preferences, an outdoor table and people assembling flatbread sandwiches while the August evening grows cooler.
The fish remains powerful.
The gathering around it is surprisingly ordinary.
Common Mistakes When Trying Surströmming
The most common mistake is eating the fish directly from the tin without accompaniments.
Another is opening a warm container indoors, where both pressure and aroma become much harder to manage.
Taking an excessively large first portion can make the flavour overwhelming. A small piece in a properly prepared sandwich offers a far better introduction.
Some visitors drink the brine or handle the whole fish as though the goal were to create the strongest possible reaction. Neither is necessary to experience the tradition.
Using sweet bread, strongly flavoured sauces or random accompaniments can also hide the balance that the Swedish meal developed over generations.
The final mistake is assuming that disliking surströmming means the tradition has failed.
Many Swedes dislike it as well.
The value of the meal lies partly in understanding where it came from, how it is eaten and why other people continue to love it.
Fun Facts About Surströmming
The name means sour or fermented Baltic herring rather than rotten fish.
Surströmming is strongly associated with northern Sweden, the High Coast and Ulvön.
The fish is traditionally caught during spring and allowed to ferment before the late-summer season.
The third Thursday of August remains culturally associated with the annual premiere.
Fermentation continues slowly inside the sealed tin, producing the pressure that can make the container appear swollen.
A rounded tin can therefore be characteristic of the product, although leaking or damaged packaging should always be treated cautiously.
The smell is usually strongest when the tin is first opened, while the flavour becomes milder when combined with traditional accompaniments.
Surströmming is normally eaten with tunnbröd, boiled potatoes, onion, sour cream and chives.
A folded flatbread sandwich containing the fish is commonly called a surströmmingsklämma.
Many Swedes have never tasted surströmming, despite its international reputation as a national Swedish food.
Public reaction videos often show the fish being eaten in ways that bear little resemblance to the traditional meal.
Experienced diners generally keep the tin cold, prepare the table first and open it outdoors.
Frequently Asked Questions About Surströmming
What is surströmming?
Surströmming is lightly salted Baltic herring that has been fermented and packed in tins while the maturation process continues.
Is surströmming rotten fish?
No. It is produced through controlled fermentation. Rotten fish results from uncontrolled decomposition and is not the same thing.
Why does surströmming smell so strong?
Fermentation produces powerful volatile compounds that become concentrated inside the sealed tin and are released when it is opened.
What does surströmming taste like?
It is salty, sour, savoury and deeply fermented, with a soft texture. The flavour is usually considered less overwhelming than the smell.
Why are the tins swollen?
Fermentation continues inside the container and produces gases, which can make the top and bottom of the tin become rounded.
Should surströmming be opened underwater?
It can be opened partly underwater to control pressure and reduce splashing, although an experienced person may open a cold tin carefully without doing so.
Why should surströmming be opened outdoors?
The aroma can remain inside rooms and soft furnishings for a long time. Outdoors, it disperses more quickly.
What do Swedes eat with surströmming?
Traditional accompaniments include tunnbröd, boiled potatoes, butter, chopped onion, sour cream and chives.
What is a surströmmingsklämma?
It is a folded soft-flatbread sandwich filled with surströmming, potato and other traditional accompaniments.
Do all Swedes eat surströmming?
No. The tradition is particularly strong in northern Sweden, and many Swedes have never eaten it.
When is the surströmming premiere?
The traditional premiere is associated with the third Thursday of August.
Is surströmming eaten directly from the tin?
Traditionally, no. The fish is cleaned or divided into small pieces and eaten with bread, potatoes and other accompaniments.
Does surströmming need to be refrigerated?
Yes. It is a refrigerated fermented product and should be stored according to the producer’s instructions.
Can beginners enjoy surströmming?
Some do. A small amount served correctly in a traditional sandwich provides a much fairer introduction than eating the fish alone.
When the Tin Is Finally Opened
Surströmming will probably always be introduced through its smell.
It is too unusual, too immediate and too powerful to ignore. The first opening of the tin creates the reaction that people remember and the story they repeat afterward.
Yet the smell explains only why the food is famous.
It does not explain why the tradition survived.
That answer is found around the table: in the potatoes boiled before the guests arrived, the flatbread passed from hand to hand and the relative who has cleaned the fish every August for as long as anyone can remember.
It is found in northern fishing communities that learned to preserve the spring catch, in families who carried those habits forward and in late-summer gatherings that continued long after fermentation was necessary for survival.
Some guests will love the first sandwich.
Others will finish one bite and politely return to the potatoes.
Both will understand that surströmming is more than a tin opened for shock.
It is regional history transformed into an annual meal—strong, disputed, deeply remembered and impossible to experience without becoming part of the conversation.
0 comments