8Tablespoons vegetable shorteningcut into 1/2-inch pieces and chilled
12 Tablespoonsunsalted buttercut into 1/4-inch pieces and chilled
Process flour, sugar, and salt together in food processor until combined, about 5 seconds. Scatter shortening over top and process until mixture resembles coarse cornmeal, about 10 seconds. Scatter butter over top and pulse mixture until it resembles coarse crumbs, about 10 pulses.
Transfer mixture to large bowl. Sprinkle 6 tablespoons of the ice water over the mixture. Stir and press dough together, using a stiff rubber spatula, until dough sticks together. If dough does not stick together, stir in remaining ice water 1 tablespoon at a time.
Divide dough into 2 even pieces. Turn each piece of dough onto sheet of plastic wrap and flatten each into a 4-inch disk. Wrap each piece tightly in plastic wrap and refrigerate for 1 hour. Before rolling the dough out, let it sit on the counter to soften slightly, about 10 minutes.
Make Ahead: Freeze your discs of pie dough for up to 3 months.