Polish Sour Cream Frosting

1 egg white

1/8 t cream of tartar

1 lb. confectioners sugar

3 to 4 T heavy sour cream

1 t vanilla

2 T soft butter or margarine

Beat egg white and cream of tartar until stiff. Blend in 1/4 of sugar. Alternately add remaining sugar and sour cream, beating until smooth after each addition. Add vanilla and butter. Yield: frosting for top and sides of two 9 inch round layers. Use jam or pudding for filling between layers.

Variations:

1. Add 1/2 cup chopped nuts.

2. Add 1 C toasted coconut.

3. Add 1/2 t cinnamon and 1/4 t allspice.