Iron Skillet Chocolate Pie
["1 c. sugar", "2 Tbsp. (rounded) flour", "2 Tbsp. (rounded) cocoa", "1 Tbsp. butter", "2 eggs, separated", "1 c. milk", "1 tsp. vanilla", "1 pie shell, baked"]
["Mix sugar, flour and cocoa.", "Melt butter in iron skillet.", "Add sugar mixture and mix lightly. Combine beaten egg yolks and milk; add to mixture, stirring constantly. Cook slowly until thick. Add vanilla and blend well.", "Pour into baked pie shell. Cover with stiffly beaten egg whites. Brown in oven."]
["sugar", "flour", "cocoa", "butter", "eggs", "milk", "vanilla", "pie shell"]