1 c. cocoa
4 1/2 c. sifted all-purpose flour
2 c. sugar
1 c. shortening
2 tsp. baking soda
2 tsp. salt
2 tsp. vanilla
2 egg yolks
1 c. sour milk (or add vinegar to plain milk to make it sour)
1 c. hot water

Mix together above ingredients. Drop by tablespoon onto greased cookie sheet. Bake at 400 degrees for 8 minutes. Cool and set aside.

FILLING:

2 egg whites, stiffly beaten
2 tsp. vanilla
4 tbsp. flour
4 tbsp. milk
4 c. confectioners' sugar
1 1/2 c. shortening, melted

Beat egg whites. Gradually add remaining ingredients, beating thoroughly at medium speed after adding each ingredient. Spread filling over half of the cooled pies and use the other half for on the top.