Don't ask me for any recipes, but I know that lutkefiske (dried cod/whitefish reconstituted with lye water) is a big deal with those Scandinavians who reside in Chicago.  It's kind of like a bitter/smelly jell-o fish.

Do NOT say that I'm disrespecting Swedes or Norse, I just remember this as being a very big deal.

Edited to add that as I recall, there was a village who didn't have anything to eat after a Norse raid, and just took the fish that they were drying out of the ashes of the fires that the Norsemen set, after the rains and snows put the fire out.  This is some type of Christmas observance, if I recall correctly.