01 - Whisk together flour, salt, and sugar in a large bowl until well combined.
02 - Cut cold butter into the flour mixture using a pastry cutter or fingertips until the mixture resembles coarse crumbs.
03 - Gradually add ice water, mixing gently just until dough comes together. Divide into two equal portions and form into discs. Wrap and refrigerate for at least 1 hour.
04 - Roll out one disc on a lightly floured surface to fit a 9-inch pie plate. Press gently into the plate, trim edges, and chill while preparing the braid.
05 - Roll out the 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: number strips 1-4 from left to right. Take strip 1 over 2, under 3, then over 4. Repeat with the new left-most strip until fully braided.
07 - Transfer braids to the chilled pie edge, pressing gently to adhere. Trim excess and use water to seal edges if needed.
08 - Refrigerate the pie for 15 minutes to firm the 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. Remove weights and continue baking if a fully crisp crust is desired.