This is a terrific all-purpose pie crust that you can use during the holiday season (or all year long) for your single-crust pie. This can be prepapred 2 days ahead of use; simply cover and refrigerate.
Mix flour, sugar and salt in food processor. Add butter and shortening. Using on/off pulses, process until mixture resembles coarse meal. Drizzle 3 T. ice water over mixture. Process just until moist clumps form, adding more ice water by teaspoonfuls if dough is dry. Gather dough into a ball; flatten into a disk. Wrap in plastic; chill until dough is firm enough to roll out, about 30 minutes.
Roll out dough on lightly floured work surface to 12-inch round. Transfer dough to 9-inch-diameter glass pie dish. Fold overhang under. Crimp edges decoratively.