Royal Icing
["3 large egg whites", "1 lb. powdered sugar", "1/2 tsp. cream of tartar", "paste or liquid food colorings"]
["Thick icing:", "In large bowl, beat egg whites and cream of tartar with mixer until frothy.", "Gradually add powdered sugar and beat 5 to 7 minutes until glossy, stiff peaks form when beaters are lifted."]
["egg whites", "powdered sugar", "cream of tartar", "liquid food colorings"]