Because it is a Swedish delicacy, and at the same time, there are many food lovers who want to challenge the smelly food. It is said that although it tastes bad, it feels good to eat it.

It is canned herring, a local specialty in Sweden. It is said to be a food that "frightens the whole world" and is famous for its strange smell.

This is how everyone describes it, the top note: a super smelly fart smell, the middle note: like falling into a pile of durian, and the base note: durian mixed with the smell of stinky tofu.

It is called a biological weapon because of its strong smell.

Canned herring (Surstromming) is a traditional Swedish specialty. After processing the herring, simmer it in light salt water, put it into a can, and let it ferment naturally until the fermentation gas swells the can, which means that the herring has been marinated, and it emits a pungent sour smell when it is opened. . It is said that this craft has a history of more than 300 years. Canned herring is famous all over the world for this characteristic. Canned herring is a canned food with a foul odor and a sour taste that is made by putting processed herring in a can and allowing it to ferment naturally. It is said that the Swedish government stipulates that canned herrings are not allowed to be opened in residential areas, and such cans are not allowed to be carried on international flights because changes in air pressure may cause the cans to rupture, with serious consequences. It can be called a biochemical weapon in the food industry. A popular science program once measured the odor value of canned herring and found that it was as high as 8070 Au, while the value of stinky tofu, which also has a strong smell, was 420 Au, which is only 1/20 of that.