Buttermilk Pie
["1 stick butter, soft", "1 1/2 c. sugar", "1 tbsp. vanilla", "1 tbsp. flour", "3 egg yolks", "1 c. buttermilk", "3 egg whites (beaten stiff)"]
["Mix first 5 ingredients. Add buttermilk. Fold in beaten egg whites. Fill one 9 in. unbaked pie crust and bake at 325 degrees for one hour."]
["butter", "sugar", "vanilla", "flour", "egg yolks", "buttermilk", "egg whites"]