Peach Blueberry Crumb Pie

Name: Peach Blueberry Crumb Pie
Ingredients: For the bottom crust:; 1/2 batch all-butter Perfect Pie Crust , chilled; For the filling:; 6 to 7 cups peaches (about 2 to 2 1/2 pounds), halved and cut into 1/2-inch slices (peeled or not—your call); 1 1/2 cups (scant dry pint) blueberries, stems removed; 1/4 cup (50 g) sugar; Juice of half a lemon; 1/4 cup plus 2 tablespoons cornstarch; For the crumb topping:; 1 cup (128 g) all-purpose flour; 2/3 cup light brown sugar; 1/2 cup unsalted butter, melted (room temperature to cool is fine); Pinch of salt; 1/4 to 1/2 teaspoon ground ginger, optional