From the King Arthur Flour recipe: "We figure we can’t repeat too often our formula for the flakiest, most tender pie crust - so here it is. The instructions are thorough, and the method can apply to your own favorite crust recipe. The method you use to put pie pastry together will, to some degree, determine the type of crust you end up with. Our latest favorite pie crust recipe uses a combination of butter (for flavor) and lard or vegetable shortening (for flakiness); an unbleached flour of about 10.5% protein (such as our Mellow Pastry Blend); buttermilk powder (for tenderness) and baking powder (for extra flakiness); salt; and vinegar (again, for tenderness) and water. Here’s the formula for a single-crust pie; just follow the directions above."