Chocolate Pie
["1 baked pie crust", "1 1/2 c. milk", "4 Tbsp. plain flour", "1 c. sugar", "1 Tbsp. cocoa", "3 egg yolks, beaten", "1 Tbsp. butter", "1 tsp. vanilla"]
["Mix sugar, flour and cocoa.", "Add beaten egg yolks, milk and butter.", "Cook in an iron skillet until thick.", "Add vanilla."]
["crust", "milk", "flour", "sugar", "cocoa", "egg yolks", "butter", "vanilla"]