"This is a good wedding cake icing. While frosting cake, keep bowl covered with a damp cloth to prevent excessive evaporation. Makes enough to frost one 3 tiered wedding cake, and to decorate with garlands and flowers."
Cream butter or margarine. Add salt and part of the sugar gradually, blending after each addition. Add remaining sugar, alternately with the egg whites first, then with the cream; beat after each addition. Beat after each addition until smooth. Add vanilla, and blend.