Chocolate Pie - cooking recipe

Ingredients

1 (9-inch) pie shell, cooked
1 c. sugar
1/2 c. sifted flour
2 egg yolks
4 Tbsp. cocoa
2 c. cold milk
2 Tbsp. butter or margarine
1 tsp. vanilla

Preparation

Mix first sugar and flour.
Drop in egg yolks and cocoa. Slowly add cold milk.
Cook on top of stove until thick.
Stir constantly.
Remove from heat, then add butter or margarine and vanilla.
Pour into pie shell.
Cover with margarine and put back in oven until golden brown.