Surströmming
"Fermented shark contains a large amount of ammonia and has a strong smell, similar to that of many cleaning products. It is often served in tiny cubes on toothpicks. Those new to it may gag involuntarily at the first attempt to eat it because of the high ammonia content.[2] First-timers are sometimes advised to pinch their nose while taking the first bite, as the odor is much stronger than the taste. It is often eaten with a shot of the local spirit, a type of akvavit called brennivín.[3]
Hákarl comes in two varieties: chewy and reddish glerhákarl ([ˈklɛːrˌhauːˌkʰa(r)tl̥], lit. "glassy shark") from the belly, and white and soft skyrhákarl ([ˈscɪːr-], lit. "skyr shark") from the body. "
Good night!
I haven’t tried it, but my friends from tell me it’s a real thing, even though they’ve never ate it.