It’s rotten fermented fish that tastes like fish flavored Jello...............
Lutefisk is dried cod that is soaked in a lye solution then throughly rinsed. This is done before you purchase it. If done right it still firm and has a gelatinous texture and a mild flavor. It is baked and you drizzle warm bacon bits and grease over it and also a mustard sauce. A side dish of cooked dried peas (like thick pea soup) is served with it. It was all washed down with plenty of beer and aquvate. I spent seven Christmas holidays in Norway and would have lutefisk at least twice a season. I liked it though not as much as baked pork rib roast which was also a holiday special.
The fermented fish is called rakfisk, different thing.