COMBINE: In a large bowl, combine flour, salt, and sugar. Add butter and use a pastry cutter or your hands to mix until the mixture resembles coarse crumbs. See NOTE #1
ADD WATER: Make a well in the center of the flour mixture. Gradually add ice water, 1 tablespoon at a time, and mix until the dough comes together. Be careful not to overmix. See NOTE #2
WRAP AND CHILL THE DOUGH: Shape the dough into a ball. Wrap in plastic wrap and refrigerate for at least 30 minutes or an hour. While the dough is resting in the fridge, make the apple pie filling (see instructions below).
ROLL OUT THE DOUGH: Remove the chilled-out dough from the fridge and divide it in half. Wrap half of the dough in plastic wrap and place it back in the fridge while working on the other half. Dust the surface and rolling pin with flour and roll out the dough to fit your pie dish.
TRANSFER: Gently fold the dough onto your rolling pin and place it into the dish, unfolding it carefully as you go. Trim any excess dough from around the edge, leaving 1/2 inch of dough hanging over the edge. Then, fold the excess dough under itself, creating a thicker edge. Refrigerate, then start working on the other half of the dough for the top crust. See NOTE #3
WORK ON THE TOP CRUST: You'll roll out the other half the same way you rolled out the bottom crust. This time, you'll place the rolled-out dough on a baking sheet pan and chill.
FILL THE PIE DISH: Remove the chilled bottom crust and fill it with the apple pie filling. Then remove the chilled top crust from the fridge (the one you place on a baking sheet pan). Place it on top of the filled bottom crust, closing the pie. Fold the edges and seal the pie making sure to press firmly to close it tight.
CRIMPING: Use your index finger and thumb to create a "V" shape in the crust, with the tip of the "V" pointing towards the center of the pie. Use the knuckle of your other index finger to guide the crimping. Place it on the inside of the crust, directly opposite the "V" you just created. Use your index finger and thumb to pinch the crust around the knuckle, creating a crimped edge. Move your knuckle to the next spot, directly next to the crimp you just made. Repeat the pinching process, working your way around the entire pie. Alternatively, you can use a fork to create a decorative edge, if desired. See NOTE#4
EGG WASH AND BAKE: Use half of the egg wash first. Using a pastry brush, lightly brush the egg wash over the surface of the pie. Make sure to cover the entire surface evenly, but be careful not to let the egg wash pool or run. Chill the pie for 5 minutes. Then remove from the fridge and use the rest of the egg wash to brush on top and around the edges of the pie (option to sprinkle brown sugar on top). Cut 4-3 slits on top for steam to release. Bake at 425ºF for 20 minutes or until golden brown. Cover with foil if it gets too dark, then reduce the heat to 350ºF and bake for another 45 minutes. If you have a thermometer you can check the internal temperature of the pie - it should be around 190-200ºF when fully baked.