Chocolate Pie - cooking recipe

Ingredients

1 c. sugar
2 heaping Tbsp. flour
3 Tbsp. cocoa
2 c. milk
3 beaten egg yolks
3 Tbsp. butter
9-inch baked pie shell

Preparation

Mix first 3 ingredients; then add milk.
Cook until thickened. Add small amount of hot mixture to beaten egg yolks.
Then add egg mixture to hot mixture.
Cook 2 to 3 minutes longer.
Take off stove, then add butter until melted.
Pour in pie shell.