Make a thin white sauce by combining the butter, flour, milk and salt and pepper in the top of a double boiler. (combine the butter and flour into a paste, cook slightly before adding milk). Place the fish in a greased pan and pour the white sauce over it. Cover and simmer very gently for half an hour, basting as necessary. Sprinkle with bread crumbs which have been mixed with the melted butter. Bake in a hot oven for 15 minutes. Remove it a hot platter and garnish with parsley and lemon. Serves:6
