Hakarl is a type of national Icelandic dish made from fermented shark meat. It's characterized by its strong smell and not so appetizing taste. If you visit Iceland it is probably going to be offered to you by the locals, just so you know what you're in for. It has a reputation for challenging the taste buds of those who are the most open-minded food lovers.
Because of its high ammonia content is has a strong smell similar to many cleaning products. It is often served as cubes on toothpicks. First timers are advised to pinch their nose in order not to gag, in Iceland it is most often served with a shot of the local alcohol. To attest for its taste even Chef Anthony Bourdain described hakarl as "the single worst, most disgusting and terrible tasting thing" he has ever eaten.