Step 1 Combine the butter, shortening, flour and salt in a food processor and pulse until the mixture forms pea-sized crumbs.
Step 2 With the processor running, add 1 tablespoon of ice water. Continue adding water, 1 drop at a time, with the processor running, until the dough begins to form a mass. You might not use all the water. Wrap the dough in plastic and chill 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 flute the edge. Chill 15 minutes.
Step 4Heat the oven to 350 degrees. Line the bottom of the pie shell with foil, then fill with pie weights, beans or rice. Bake until the crust is light golden brown, about 15 to 20 minutes. Let cool on a rack. Remove the weights and foil.