Chocolate Pie - cooking recipe

Ingredients

1 c. sugar
1/2 c. Pet milk
2 egg yolks
1 1/2 c. sweet milk
3 Tbsp. (level) flour
3 Tbsp. (level) cornstarch
2 Tbsp. cocoa or more
1 level Tbsp. butter

Preparation

Mix all ingredients together and cook over medium heat, stirring constantly, until thick. Put in cooked pie shell.