What is cold milt, I think I heard it was a scandinavian dish?

Cod and Had fish have a roe sack, it is the female egg sack, they process it and you can buy it in tins, in Sweden and I visited once when I was chef, they sell it plain or smoked, it is cooked in butter and serve at breakfast like bacon, smoked one ca be use for other meals, added to mashed potato's and little croquettes made with it, fried in a pan or deep fried