Beat the whites until stiff but not dry. Add sugar, lemon juice and glycerin (if using); beat for 1 minute more. If icing is too thick, add more egg whites; if it is too thin, add more sugar. The icing may be stored in an airtight container in the refrigerator for up to 3 days.Advertisement
You can substitute 5 tablespoons meringue powder and 1/3 cup water for raw eggs. Raw eggs should not be used in food prepared for pregnant women, babies, young children, or anyone whose health is compromised.