In the bowl of a food processor fitted with the blade attachment, place flour, salt, and sugar. Pulse until combined, approx 30 seconds.
Add the chilled butter and shortening. Pulse for about 8-10 quick pulses until the mixture resembles cottage cheese. Fat pieces should be well coated in flour and approx pea-sized.
Pour the mixture into a medium mixing bowl and lightly sprinkle water and vinegar measurements over the top of the fat and flour mix. Using a rubber spatula, gently fold in liquids.
Need very briefly until mixture comes together. Cover in plastic and chill for 30 minutes before rolling out.
Remove the dough from the refrigerator and allow it to come to room temperature for 15 minutes before rolling. Place the dough on a floured surface and roll into a circle about 10 inches in diameter.
Gently lift the dough into a pie plate and lightly press it into place. Trim any overhanging dough, and crimp or flute the edges.
Place the pie crust back in the refrigerator for 30 minutes before baking.