If its slimy, you’re cooking it wrong. Heavily salt it and bake it in the oven to draw the liquid out. It should only smell like dick cheese (kukost) before cooking. Afterwards it should smell and taste like slightly caustic fish and be barely palatable if you have it with mashed potato, bacon bits, and mushy peas and wash it down with strong astringent alcoholic drink. It’s pretty rank but by no means the worst Nordic dish. A dubious honour that probably goes to Greenland’s kiviak.