Using a food processor or a pastry blender, cut cold butter into the flour and salt until mixture resembles a coarse meal; small pea sized pieces of butter should still be visible.
Using a cup, pour the vinegar into the cold water; mix to combine.
Pour the vinegar and cold water mixture over the butter and flour mixture; toss with a fork until dough begins to form; use your hands as little as possible and work the dough as little as possible.
Form the dough into a ball; divide into 2 balls; flatten into two 6-inch rounds; wrap in plastic wrap and place in the refrigerator to rest for a minimum of 20 minutes.
The dough can be made a day ahead; ensure it is taken out of the refrigerator for 10 minutes, prior to using, to warm slightly before rolling out.
This pastry recipe makes enough dough for two pie crusts; wrap one of the pastry rounds tightly in plastic wrap and freeze it for later use.
Roll the dough into a 12 to 14-inch round and place in the bottom of a 9.5-inch pie plate.
Push the dough into the corners and ensure that it is not stretched at all or it will shrink from the edge.
Trim dough to a 1/2-inch past the edge of plate.
Fold the ends under and pinch with fingers or fork to shape the edges into whatever design you like best.
Place in freezer for 10 to 15 minutes to chill before adding the filling.