In a food processor or large bowl, pulse or mix together flour and salt.
Add shortening and butter. Pulse 8-12 times or use a pastry cutter to work shortening and butter into flour until it resembles a coarse meal. If using a pastry cutter, it'll take a few minutes.
In a small bowl, whisk together egg, vinegar, and cold water and pour into the food processor with flour mixture and pulse until dough begins to form a ball. If using a bowl, stir together until dough starts to combine, then use your hands to finish forming together. If the dough seems dry, add up to another ½ tablespoon cold water.
Roll dough into a ball and wrap with plastic wrap. Place in the freezer for 15-20 minutes before rolling out.
Roll dough out on a well-floured surface into a circle. Roll from center to edge, turning and flouring the dough so it doesn't stick.
Nutritional information is automatically calculated by a third party software and is only an estimate, not a guarantee. This information is provided as a courtesy, and you are solely responsible for all decisions related to your health.
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