01 - Whisk together flour, salt, and sugar in a large bowl until evenly combined.
02 - Cut cold butter into flour mixture using a pastry cutter or fingertips until mixture resembles coarse crumbs.
03 - Gradually add ice water, mixing gently just until dough comes together. Divide dough in half and form into discs. Wrap and refrigerate for at least 1 hour.
04 - Roll out one disc on lightly floured surface to fit 9-inch pie plate. Press into plate, trim edges, and refrigerate while preparing braid.
05 - Roll out second 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 together. For each set, label strips 1-2-3-4 left to right. Take left-most strip over 2, under 3, over 4. Repeat with new left-most strip until fully braided.
07 - Transfer braids to chilled pie edge, pressing gently to adhere. Trim excess and use water to seal edges if needed.
08 - Refrigerate pie for 15 minutes to firm crust. Preheat oven to 400°F.
09 - Brush braids with beaten egg mixed with milk. For blind baking, line crust with parchment and fill with pie weights.
10 - Bake for 12-15 minutes until golden brown. Remove weights and bake additional time if needed for crispiness.