Cod roe are the eggs of codfish. The egg sacks are sold fresh, frozen, or canned. The fresh sacks may be burst and the eggs eaten fresh or salted and preserved as a type of caviar. The simplest preparation is to boil the sacks, and just slice it up and eat it. It is a very rich food, which I guess is what one would expect from a plate of eggs. The cooked flavor is mildly fishy, not as strong as some other fish roe. Cod roe is enjoyed from Scotland to Korea, and many places in between. I think it is a treat.