Chocolate Pie Filling
["3 eggs, separated", "1 1/2 c. milk", "3/4 c. sugar", "1 Tbsp. cocoa", "2 Tbsp. cornstarch or plain flour", "2 Tbsp. butter", "1/2 tsp. vanilla", "1/4 tsp. salt"]
["Mix sugar, salt, cocoa and cornstarch or flour until well blended, set aside.", "Heat milk just till hot, add sugar mixture and bring to a boil in a heavy saucepan, stirring constantly. Beat egg yolks and add about 1/2 of hot mix while stirring.", "Add back to hot custard in sauce pan while stirring.", "Heat until boils again.", "Stir in butter and vanilla and cool.", "Pour into baked pie shell."]
["eggs", "milk", "sugar", "cocoa", "cornstarch", "butter", "vanilla", "salt"]