Preheat the oven to 400 degrees F and line a baking sheet with parchment paper.
In a large bowl combine the sliced stone fruit, sugar, and instant tapioca. Set aside.
On a lightly floured surface, roll out the pie dough in a rough circle to about ⅛'' in thickness. Arrange the stone fruit on the pie dough, leaving a two inch border around the edge.
Fold the edges over the fruit. Transfer the galette to the prepared baking sheet. Brush the edges of the dough with the egg wash and sprinkle with raw sugar.
Turn the oven down to 375 degrees F and bake the galette for 45-50 minutes or until the edges are a deep golden brown. Allow galette to cool for 10-15 minutes before topping with ice cream and serving.
Notes
Weigh out your fruit after you have cut them up.
You'll want to bake the galette longer than you would think. Don't be afraid to take it a little too far and get some black spots on the crust. It is much better to have a few burnt spots on the top than to have a soggy crust.
Don't skip out on the vanilla ice cream! The hot-cold combination makes it the perfect summer dessert!