MACKEREL À LA HAVRAISE

Clean the fish, take out the backbone and put into a baking-pan. To each mackerel add four tablespoonfuls of butter, two tablespoonfuls of chopped shallots, and salt, pepper, and grated nutmeg to season. Add two cupfuls of white wine, cover and cook slowly for thirty minutes. Take up the fish, thicken the sauce with a tablespoonful each of butter and flour cooked together, and boil, for five minutes. Take from the fire, add the yolks of three eggs beaten with a cupful of cream, season with lemon-juice and minced parsley, pour over the fish, and serve.