In a large bowl, mix together the flour, sugar and salt. Using a box grater, grate the cold butter atop the flour mixture. Working quickly, and using your hands, break the butter bits into the flour until they're evenly distributed and resemble the size of small peas.
Add a 1/2 cup of water and mix. The mixture will be shaggy at this point. From here, add 1 tablespoon of water at a time until the dough comes together (I usually need to add 3 to 4 tablespoons). Flour your counter and dump the dough onto it. Knead a few times more until it comes together. Divide the dough, forming two discs. Wrap the discs in plastic wrap and transfer to the refrigerator to chill for at least 1 hour, ideally overnight.
Remove the first disc of dough from the refrigerator and allow to come to room temperature for 10 minutes. Liberally flour your work surface and rolling pin. Begin to roll the dough, being sure to rotate it every so often to avoid sticking, to a 13-inch round. Wrap the dough around the rolling pin and unroll it over the pie tin. Gently fit the dough into the bottom and up the sides of the pie tin. Trim the dough around the pie tin, leaving a 1-inch overhang. Add your filling and transfer the pie to freezer while you roll out the second disc of dough.
Remove the second disc of dough from the refrigerator and repeat the rolling process as you did with the first disc. You have a couple of options, you could simply lay the second rolled out sheet of dough on top, making a few slits with a knife so steam can escape. You can do a lattice. You could even punch out holes or any sort of shape and place it on top. Crimp the edges and brush with the egg wash.