Place the cherries in a bowl. Toss with the sugar, cornstarch and salt, making sure to coat all the cherries. Drizzle in the vanilla extract and toss.
Remove one of the crusts from the fridge. (The other is good for another week or so, or it can be frozen.) Roll one of the pie crusts into a… “rustic” shape – no shape necessary really – until it is about 1/4 inch thick. Place the dough on a parchment-lined baking sheet. Places the cherries in the center leaving a 2-inch+ border of crust. Top with the butter cubes.
Once the cherries are placed, fold the crust over top of them. Brush the crust with the beaten egg wash. Sprinkle it with the raw sugar. Bake the galette until the crust is golden, about 40 to 45 minutes.
Remove it and let cool slightly, then slice. Serve warm with vanilla ice cream.