In a food processor, pulse several times to combine 1 1/4 cups all-purpose flour, spooned and leveled, and 1/2 teaspoon each salt and sugar.
Add 1/2 cup (1 stick) cold unsalted butter, cut into small pieces. Pulse until mixture resembles coarse meal, with a few pea-size pieces remaining.
Add 2 tablespoons ice water; pulse until dough is crumbly but holds together when squeezed (if needed, add up to 2 more tablespoons ice water, 1 tablespoon at a time). Do not overmix.
Turn out onto work surface; knead once or twice, until dough comes together. Flatten dough into a disk, wrap in plastic, and refrigerate at least 1 hour.
Place dough on a floured piece of parchment or waxed paper. Using knuckles, press edges of dough to help prevent cracking when you roll it out.
Roll dough to a 14-inch round. Using parchment, lift and wrap dough around rolling pin; carefully unroll over a 9-inch pie plate. Gently fit into bottom and along sides of plate, being careful not to stretch or tear dough.
Using kitchen shears or a paring knife, trim dough to a 1-inch overhang; fold under, and seal to form a rim. Crimp rim with fingertips. Prick bottom of pie dough all over with a fork, to prevent it from puffing up or shrinking in the oven. Refrigerate until chilled, about 1 hour.
If prebaking the crust, preheat oven to 350 degrees. Bake until crust is firm and golden, about 20 minutes. Cool completely before filling.