3 egg whites
1 lb. confectioners' sugar
1/2 tsp. cream of tartar
1/2 tsp. almond extract or white vanilla extract

Place all ingredients in bowl and beat on medium high for a full 10 minutes. Icing will become thick and glossy but will not increase in volume. Keep covered with damp cloth while using, removing small portions to bowl as needed. Tint if desired. To thin, add a few drops of water. Royal icing hardens with a nice sheen.