A nearly rotten fishy/fish type delicacy that has fermented for at least six months and is usually packaged or sealed in a can and is often described as the smelliest food in the whole world.
by 0221SAM June 12, 2018

Fermented Baltic herring. Purported by some (but by no means all) Swedes to be a highly-prized delicacy. Asserted by everyone else to be rotten fish in a can.
by taupehat April 10, 2011
