A fish boil is a Great Lakes culinary tradition in areas of Wisconsin (USA), with large Scandinavian populations, particularly Door County, Port Wing and Port Washington, Wisconsin. The meal consists of Lake Michigan or Lake Superior whitefish (though lake trout can be used), with other ingredients.The fish is typically caught by local fishermen, cut into small chunks and cooked in boiling water with red potatoes. Some boilers add onions as well. Salt is the only seasoning used, and used only to raise the specific gravity of the water.