Surströmming (“soured (Baltic) herring”) is a northern Swedish delicacy consisting of fermented Baltic herring. Surströmming is sold in cans, which when opened release a strong smell. Because of the smell, the dish is often eaten outdoors. However, opening the can under water or inside a plastic bag, somewhat lessens the smell, as well as prevents the person opening it from being soaked in brine, as the fermentation often builds up a considerable pressure inside the can.
( source: Wiki )

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