Lutefisk washed down with aquavit and beer, that's Christmas. It's not for everyone, you have to be brave to enjoy it. My parents always had that as a part of the Christmas dinner. Lutefisk is dried cod or ling soaked in lye for days, until it turns gelatinous. Some say the aquavit is there to get the taste of lutefisk out of your mouth.
That's very different than salt cod that you have to soak in water for days, something I've eaten before. I've tried lutefisk and it's not for the faint-hearted.