01 - Whisk together flour, salt, and sugar in a large bowl until evenly combined.
02 - Cut cold butter into the flour mixture using a pastry cutter or your fingertips until the mixture resembles coarse crumbs with pea-sized butter pieces remaining.
03 - Gradually add ice water, mixing gently with a fork just until the dough comes together. Divide dough in half and form into two discs. Wrap separately and refrigerate for at least 1 hour.
04 - Roll out one dough disc on a lightly floured surface to fit a 9-inch pie plate. Gently press the dough into the plate, trim edges evenly, and refrigerate while preparing the braid.
05 - Roll out the second dough disc to approximately 1/4 inch thickness. Cut twelve long, even strips about 1/2 inch wide using a sharp knife or pastry wheel.
06 - Group strips into three sets of four. Pinch the tops of each set together. For each set, label strips left to right as 1-2-3-4. Cross strip 1 over 2, under 3, then over 4. Repeat with the new left-most strip until fully braided.
07 - Carefully transfer braids to the chilled pie edge, pressing gently to adhere. Trim any excess dough. Brush with a small amount of water to help seal if necessary.
08 - Refrigerate the assembled pie for 15 minutes to firm the crust. Preheat oven to 400°F.
09 - Whisk together beaten egg and milk. Brush the braided crust generously with the egg wash using a pastry brush.
10 - Line the crust with parchment paper and fill with pie weights. Bake for 12–15 minutes until golden brown. Remove weights and continue baking if a crispier crust is desired.
11 - Fill and bake according to your chosen pie recipe, following specific filling instructions.