Best Chocolate Pie
["3 Tbsp. flour", "3 Tbsp. cocoa", "1 c. sugar", "1 1/2 c. milk", "3 egg yolks", "2 Tbsp. butter or margarine", "1 tsp. vanilla"]
["Cook over medium heat the flour, cocoa, sugar, milk and yolks until thickened, stirring continually.", "Add butter and vanilla and cook until thick.", "Pour into baked pie shell.", "Top with meringue from 3 egg whites.", "Brown at 350\u00b0."]
["flour", "cocoa", "sugar", "milk", "egg yolks", "butter", "vanilla"]