Surströmming (Swedish "soured (Baltic) herring") is a northern Swedish dish consisting of fermented Baltic herring. Surströmming is sold in cans, which may bulge after prolonged storage, due to the continued fermentation.
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A Japanese study has shown that the smell of a newly opened can of surströmming is the most putrid smell of food in the world, beating similar fermented fish dishes such as the Korean Hongeohoe or Japanese Kusaya.