Chocolate Pie
["1 c. sugar", "1/3 c. flour", "1/3 c. cocoa", "pinch of salt", "3 egg yolks", "2 c. milk", "2 Tbsp. butter", "1 tsp. vanilla", "1 (9-inch) pie shell, baked"]
["Sift sugar, flour, cocoa and salt.", "Beat egg yolks and milk. Stir egg and milk mixture into dry ingredients to form a smooth paste, then stir in remaining liquid.", "Stir constantly until mixture comes to a boil and thickens.", "Continue stirring about 3 minutes.", "Remove from heat; stir in vanilla and butter.", "Pour into a baked 9-inch pie shell."]
["sugar", "flour", "cocoa", "salt", "egg yolks", "milk", "butter", "vanilla", "pie shell"]