Start by gathering all your ingredients. Make sure your butter is cold and cubed.

In a large bowl, combine the all-purpose flour and salt, mixing until well-blended.

Add the cubed butter to the flour mixture. Using a pastry cutter or your fingers, work the butter into the flour until the mixture resembles coarse crumbs.

Incorporate the sourdough starter discard into the flour mixture. Stir with a fork until a dough begins to form.

If the dough seems too dry, add cold water one tablespoon at a time until it holds together.

Form the dough into a disk, wrap it in plastic wrap, and refrigerate for at least 30 minutes.

Once chilled, roll the dough on a floured surface to your desired thickness. Transfer it to a pie dish and trim the edges as needed.

If your recipe requires a pre-baked crust, preheat your oven to 375°F (190°C) and bake for about 20-25 minutes, or until lightly golden.