Sift & measure flour into large bowl.
Add salt and stir.
Cut in shortening with pastry blender until size of small peas.
Beat egg in a 1 cup measuring cup.
Add vinegar to egg.
Add cold water to egg mixture {about 3/4-1 cup cold water}.
Add liquid to flour mixture and stir slightly with a fork to form a ball (you won't use all the water).
Use a fork to form a loose ball and divide in half and place on two pieces of plastic wrap.
Chill in fridge for 1 hour.
Roll pastry out onto floured surface with a rolling pin.
Note: If your recipe calls for baking the pastry first, prick all the sides and bottom area with a fork and bake at 450 deg for 8-10 minutes.
Use your favorite pie filling recipe for regular baking instructions.