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 mixture resembles coarse crumbs with some pea-sized butter pieces remaining.
03 - Gradually add ice water, mixing gently just until dough comes together. Divide dough in half and form into two discs. Wrap tightly and refrigerate for at least 1 hour.
04 - Roll out one dough disc on lightly floured surface to fit 9-inch pie plate. Press gently into plate, trim edges evenly, and refrigerate while preparing braid strips.
05 - Roll remaining dough disc to 1/4 inch thickness. Cut twelve long, even strips approximately 1/2 inch wide.
06 - Group strips into three sets of four. Pinch tops of each set together. For each set, label strips 1-2-3-4 from left to right. Cross strip 1 over 2, under 3, over 4. Repeat with new left-most strip until fully braided.
07 - Carefully transfer braids to chilled pie edge, pressing gently to adhere. Trim excess dough. Use small amount of water to help seal edges if necessary.
08 - Refrigerate assembled pie for 15 minutes to firm crust. Preheat oven to 400°F.
09 - Brush braids thoroughly with egg wash mixture. For blind baking, line crust with parchment paper and fill with pie weights.
10 - Bake for 12–15 minutes until golden brown. Remove pie weights and continue baking if needed for fully crisp crust.