01 - Whisk together flour, salt, and sugar in a large bowl until evenly combined.
02 - Cut cold butter into dry mixture using a pastry cutter or fingertips until texture resembles coarse crumbs with some pea-sized pieces remaining.
03 - Gradually drizzle ice water over mixture while gently tossing with fingers. Mix just until dough holds together when pressed. Divide in half and form into two discs. Wrap tightly and refrigerate for minimum 1 hour.
04 - Roll one dough disc on lightly floured surface to 1/8-inch thickness. Carefully transfer to 9-inch pie plate, pressing gently into bottom and up sides. Trim edges flush with rim. Refrigerate while preparing braids.
05 - Roll second dough disc to 1/4-inch thickness. Cut twelve even strips approximately 1/2-inch wide and 8–10 inches long using a sharp knife or pastry wheel. Group strips into three sets of four.
06 - For each set, pinch tops of four strips together. Label strips left to right as 1-2-3-4. Cross strip 1 over strip 2, under strip 3, over strip 4. Repeat pattern always crossing the new leftmost strip over, under, over until braid is complete. Pinch end to seal.
07 - Carefully transfer braids to chilled pie crust edge, pressing gently to adhere. Trim excess dough. Brush underside with water if needed for better adhesion. Refrigerate assembled pie for 15 minutes.
08 - Preheat oven to 400°F. Whisk egg with milk for egg wash. Brush evenly over braided crust and edge.
09 - Line crust with parchment paper and fill with pie weights or dried beans. Bake for 12–15 minutes until light golden. Remove weights and parchment. Continue baking 3–5 additional minutes if bottom needs additional crisping.
10 - Proceed with your chosen pie filling recipe. Return to oven as directed for filled pie baking time.