Sweet Potato Pie
["2 c. sweet potatoes", "1 c. milk or 1 c. condensed milk", "4 Tbsp. butter", "1/2 tsp. nutmeg", "1 tsp. cinnamon", "1 tsp. vanilla or lemon", "3 beaten egg yolks", "3/4 c. sugar", "1/2 tsp. salt", "3 stiffly beaten egg whites"]
["Cream butter and sugar.", "Mix together sweet potatoes, milk, butter and sugar, nutmeg, cinnamon, vanilla, egg yolks and salt. Fold in 3 stiffly beaten egg whites.", "Bake at 450\u00b0 for 10 minutes, then at 350\u00b0 for 50 minutes."]
["sweet potatoes", "milk", "butter", "nutmeg", "cinnamon", "vanilla", "egg yolks", "sugar", "salt", "egg whites"]