Lightly dust a clean surface with flour. Unwrap the dough from the plastic wrap and lightly dust the top of it with flour. Roll out the dough until it is 1/8th inch thick. Use a ring cutter that is about 4 1/2 inches in diameter to cut out about 12 circles. Alternatively, you can use a bowl with the same diameter and trace a knife around it. Place the circles of dough onto a sheet tray lined with parchment paper. Reserve the remaining scraps of dough.
Add a heaping tablespoon of the cherry filling mixture to the center of each circle of dough. Fold one side of the dough over until it aligns with the other side. Use a fork to crimp the edges together.
Combine the remaining scraps of dough into a ball and roll it out to 1/8 inch thickness. Cut 24 thin strips of dough that are each about 8 inches long. Roll each strip into a rope shape. Take two of the ropes and begin twisting them together to form a braid-like design. Brush the crimped edge of the pie with the egg wash. Lay the twisted rope over the crimped edge and press the ends into the dough. Cut off any excess dough. Repeat this process with the remaining handpies.
Brush the surface of the handpies with the egg wash. Use a paring knife to cut three small slits into the tops of the handpies. Sprinkle some of the demerara sugar onto the tops of the handpies.
Place the handpies into a preheated 400˚F oven. Bake for about 30-35 minutes until the crust becomes golden brown. Remove the handpies from the oven and allow them to rest for about 10 minutes before serving. Enjoy!