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 1/2 cup of 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. 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 discs 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. Using a 3-inch cookie cutter, cut out as many circles as you can (I got about 6 the first time). Reroll the scraps so you get 2 to 4 more. Transfer the pie circles to a parchment-lined baking sheet and place in the refrigerator while you roll out the other disc of dough. Repeat the rolling and cutting out with the second disc of dough. If you like, you can make little cut outs with the tops of the hand pies. I used the opposite side of a piping tip to make circles. This allows steam to escape as well as provide a lil' style to the hand pies.
To assemble the hand pies, remove the baking sheet with the pie circles from the refrigerator. Brush each bottom half with egg wash and drop a scant teaspoon of the cherry mixture into the center of each circle. Top with the circles that were just rolled out. Using the tines of a fork, go around each hand pies, pressing the edges together to seal them. If you like, you can use a paring knife to trim any uneven edges on the hand pies. (I did this. I wanted perfect circles, man!)
Transfer the assembled hand pies to the freezer for 15 to 20 minutes, until very firm. While the hand pies are in the freezer, preheat your oven to 425 degrees F.
Place the baking sheet in the oven and bake for 12 to 15 minutes, until the tops are golden brown.