Add 1/2 teaspoon baking soda to 1 cup buttermilk.

Cream 1/2 pound butter with 2 1/3 cups sugar. Sift 3 cups flour. Add 5 egg yolks alternately with flour and cup of buttermilk. Add flavoring, 2 1/2 tablespoons vanilla.

Fold egg whites into mixture. Can be baked as a layer cake or in a tube pan. If baked in a tube pan use the following degrees:

20 minutes at 375 degrees

20 minutes at 350 degrees

20 minutes at 325 degrees

If baked as a layer cake bake at 350 degrees for 35 to 40 minutes.