Ingredients:
1/2 cup Dutch process cocoa powder
3/4 cup boiling water
1 cup sour cream
1/2 teaspoon baking soda
2 cups sifted cake flour
1/2 cup butter
2 cups white sugar
3 egg whites
1 1/2 teaspoons vanilla extract
6 Tablespoons butter, softened
3/4 cup Dutch process cocoa powder
2 2/3 cups confectioners' sugar
1/2 cup milk
1 teaspoon vanilla extract
Directions:
1. In a small bowl, mix together 1/2 cup cocoa and 3/4 cup boiling water; set aside.
2. In another small bowl, dissolve baking soda in the sour cream by stirring them together.
3. In a large bowl, cream the 1/2 cup butter and 2 cups sugar. To the butter and sugar mixture, alternately add the sifted flour and the cocoa mixture with the sour cream mixture. Beat until fluffy.
4. Beat the egg whites until stiff and fold in the egg whites and 1 1/2 teaspoons of vanilla.
5. Grease a 9x13 inch pan and pour the batter into it. Bake at 300 degrees F (150 degrees C) for 50 minutes. Frost with La Famiglia Chocolate Frosting (recipe below).
source here
