Preheat the oven to 350 degrees. Cover a baking sheet with parchment paper.

In a medium bowl combine cherries, 1/2 cup of brown sugar, lemon juice, flour and salt. Stir and then set aside.

Place pie crust dough in middle of parchment lined baking sheet. Place cherry filling onto the center of the dough, leaving a two-inch outer border. Fold edge up over filling, overlapping and creating pleats as you go all the way around.

Brush the dough with the egg and sprinkle the entire galette with the remaining brown sugar.

Bake at 375 for 40-50 minutes or until crust is golden brown and dough on bottom is done. Cool slightly before serving.