2/3 cup sugar
3 tbsp. cocoa
2 cups milk
3 tbsp. flour or cornstarch
1 tsp. vanilla
3 egg yolks, beaten
1 tbsp. butter
Baked pie shell

Mix dry ingredients. Add milk, cook, stirring until thickened. Add small portion into eggs; blend well. Pour egg mixture into hot mixture. Cook, stirring until thickened. Remove from heat; add vanilla and butter. Pour into baked pie shell. Top with meringue or whipped topping.