Wikipedia
Lutefisk (Norwegian) or Lutfisk (Swedish) or Ludfisk (Danish) (pronounced [lʉːtfesk] in Northern Norway, [lʉːtəfɪsk] in Central and Southern Norway, [lʉːtfɪsk] in Sweden, in Denmark [luð̞ˠfesk] and in Finland (Finnish: lipeäkala)) is a traditional dish of the Nordic countries. It is made from aged stockfish (air-dried whitefish) or dried/salted whitefish (klippfisk) and lye (lut). It is gelatinous in texture, and has an extremely strong, pungent odor. Its name literally means "lye fish."
The only good part about lutefisk is that your hands will never be cleaner than after making a batch