Step 1 Combine the butter, shortening, flour and salt in a food processor and pulse until the mixture forms pea-sized crumbs. Be careful not to overmix.
Step 2 Add 1 tablespoon of ice water with the processor running. Continue adding water, a few drops at a time, with the processor on until the dough begins to form a mass. You may not use all the water. Wrap the dough in plastic and chill it about 30 minutes.
Step 3Roll out the dough 1/4 inch thick on a lightly floured surface. Line a 9-inch pie plate with the dough and decoratively flute the edges. Chill it about 15 minutes.
Step 4Heat the oven to 350 degrees.
Step 5Line the bottom of the pie shell with foil, then fill the pie with weights, dried beans or rice. Bake the crust until it is light golden brown, about 25 minutes. Cool it on a rack. Remove the weights and foil.