Old Fashioned Chocolate Pie
["1 c. sugar", "3 Tbsp. flour", "2 Tbsp. cocoa", "3 eggs, separated", "2 c. milk", "1 stick margarine", "1 Tbsp. vanilla", "1 baked pie crust", "6 tsp. powdered sugar"]
["Mix sugar, flour and cocoa.", "Beat yolks, adding milk and vanilla.", "Add to dry ingredients and mix well.", "Add margarine and cook in a double boiler until thick.", "Pour into crust."]
["sugar", "flour", "cocoa", "eggs", "milk", "margarine", "vanilla", "crust", "powdered sugar"]