Recipes for sweet potato pie vary. Many people develop their own recipes. A new variant of the old fashioned potato pie calls for 4 large sweet potatoes. When selecting potatoes, make certain potatoes are round instead of pointy (pointy ends have a lot of strings). Other ingredients needed are: 2 eggs, 1 1/2 cups butter or margarine, 1 teaspoon nutmeg, 1/2 teaspoon cinnamon, 2 teaspoons of vanilla extract and 2 large graham cracker crusts. Boil potatoes with the skin on until tender. Whip potatoes while adding ingredients. Fill pie crusts almost even with the top. Bake at 350 degrees until brown. Remove and let rest on baking rack.