Pulse the cold butter & shortening into the flour sugar and salt using a food processor until the shortening & butter is reduced to pea sized pieces.
Sprinkle the water & vinegar mixture over the surface and toss with a fork until the water is just incorporated into the dough. Do not over work the dough; handle it only enough so that the dough stays together.
Roll out into a 12 inch round and place into a 9 inch deep dish pie plate. Tuck the excess pastry under the edges and flute the edges with your fingers or a fork.