Chocolate Pie - cooking recipe

Ingredients

1 c. sugar
3 level Tbsp. cornstarch
2 level Tbsp. cocoa
4 eggs, separated
1/2 stick butter or margarine
1/3 c. evaporated milk
1 2/3 c. milk
1 tsp. vanilla

Preparation

Mix together sugar, cornstarch, cocoa, egg yolks, evaporated milk and a pinch of salt, if desired.
Add milk and butter.
Cook on medium heat until thick and smooth.
Add vanilla.
Put in baked 9-inch pie shell.