1/2 c. butter
2 c. sugar
3 eggs, separated
1 c. sour milk
1 tsp. baking soda
2/3 c. cocoa diluted in
1/2 c. boiling water
1/2 tsp. salt
1 tsp. vanilla

Beat butter and sugar well. Add beaten egg yolks and vanilla. Sift flour, baking powder and salt alternately with sour milk and soda. Last fold in beaten egg white. Bake in two 9 inch pans, 25-30 minutes at 350 degrees.