Chocolate Pie - cooking recipe

Ingredients

1 1/4 c. sugar
1 1/2 c. milk
3 egg yolks
3 heaping Tbsp. flour
3 level Tbsp. cocoa
lump of butter
1 tsp. vanilla

Preparation

Cook mixture until thick.
Add vanilla.
Add lump of butter after mixture cooks.
If mixture begins to lump, then reduce heat and beat until smooth.
Cook slow until done or thickened.
Pour into cooked pie shell.