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Well, they eat this:

The google translation: "First time we tried surplus flow"

Wiki: "Surströmming is a type of fermented Baltic Sea herring."

OMG

This explains the way dogs greet each other ;-)

The Japanese and Koreans have similar fermented fish (a nicer word for rotten). I have tasted it and once out of the can it is not that bad - but an intense thing it is. The black metal of food.