Step 1

To make the crust, combine flour, sugar and salt in a mixing bowl. Alternatively, you can also process this in the food processor for 10 seconds.

Step 2

Cut chilled shortening into flour with two knives until mixture is uniform and shortening resembles large peas. Do not overwork. You can also add this to the food processor in pulses.

Step 3

Beat egg (if using), water and vinegar together. Pour evenly over the flour mixture. Stir with wooden spoon until well combined and all of the mixture is moistened. If making dough in a food processor, slowly add in the liquid mixture gradually, with the motor running.

Step 4

Without overworking it too much, shape dough into a ball and lightly flatten into a circle of about 10 cm. Wrap and chill for 30 minutes (or longer, if making ahead). If freezing, double wrap in plastic and freeze for up to 3 months.

Step 5

When the crust has cooled and you're ready to bake the pie, cover your working surface with parchment paper. Lightly dust it with flour. Transfer dough onto the lightly floured piece of parchment paper, and cover with another piece of parchment paper. Roll dough between the two pieces of parchment to a uniform thickness with light, even strokes. Roll out a circle about 1 inch larger than an upside-down pie plate, to about 1/2-inch thickness.

Step 6

Remove the top layer of parchment paper (if parts tear off, simply stick them back together). Using the bottom piece of parchment paper, transfer the gluten free pie crust onto the pie plate. Invert it, and press onto the pie plate using the parchment paper. Gently remove the paper, and patch any holes or tears. Flute the edges as desired. Use in your favorite pie recipe, or freeze for future use for up to 3 months.