Fry the onion in the salt pork or bacon fat until it is lightly colored. Remove salt pork. Add fish, potatoes, bay leaves and enough water to cover.
Cook until done (about 45 minutes). Mix flour in milk, stirring well to avoid lumps. Add to fish carefully, stirring slowly.
Simmer, gently for 5 minutes. Add butter, sprinkle with paprika and let stand a few minutes before serving.
Servings: 4