How to Make It
Pulse flour and salt in a food processor until combined, 3 to 4 times. Add cubed butter and shortening, and pulse until mixture resembles small peas, 4 to 5 times. Sprinkle 4 tablespoons ice water over top of mixture. Pulse 4 times. Add up to 2 more tablespoons of water, 1 tablespoon at a time, pulsing after each addition until dough just begins to clump together.
Turn dough out onto a lightly floured work surface; gently knead until dough comes together, 2 to 3 times. Divide dough in half. Shape and flatten each half into a disk. Wrap each disk in plastic wrap. Chill 2 hours or up to 2 days.