Orange Cream Sauce

Stir the yolks of 4 eggs with 1½ tablespoonfuls sugar to a cream; add 1 teaspoonful butter, a little grated orange peel and ½ pint sweet cream or milk; put the ingredients in a small saucepan over the fire and stir till boiling hot; when cold mix it with a few spoonfuls whipped cream. Lemon Sauce is made in the same manner. This sauce may also be flavored with vanilla or lemon extract.