3 c. flour, sifted
1 c. sour cream
1/2 lb. butter, softened
3 c. sugar
6 eggs, separated
1 tsp. baking soda
1 tsp. vanilla

Generously grease and lightly flour tube pan. Add baking soda to sour cream and set aside. Cream butter and sugar. Add egg yolks, one at a time, mixing well after each addition. Alternately mix in sour cream and flour. Mix well after each addition. Add vanilla. Beat egg whites until stiff and fold in last. Pour into prepared tube pan. Bake at 300 degrees for 1 1/2 hours. Cool in pan 30 minutes before turning onto wire rack. When completely cooled, store in tightly covered container or wrap in plastic wrap. Better if made the day before serving.