2 egg whites
1 1/2 c. sugar
1/4 tsp. cream of tartar
1/3 c. cold water
1/2 tsp. white vinegar
1 tsp. vanilla

In top of double boiler combine all ingredients but vanilla. Cook over moderate heat, beating until fluffy and stiff, about 4 minutes. Remove from heat and add vanilla. Continue to beat until a good spreading consistency is formed, 3 to 4 minutes or longer if needed.