Put flour and salt in food processor bowl. Whirl to mix flour and salt together. Put margarine in with flour and pulse until mixture is cut in and crumbly. Drizzle 2 tbsp of milk over flour mixture. Pulse, if dry add additional milk to pastry until it starts coming together.
Press into pie pan, and press up sides. Prick bottom and sides of pie crust randomly with a fork.
Cook in over about 18 to 22 minutes, until starting to become golden brown.