Peach Blueberry Pie

1 1/2 cups sugar
6 tablespoons quick-cooking tapioca (reserve one to sprinkle on pie crust bottom)
1/2 teaspoon coarse salt
3 pounds peaches, peeled and sliced (6 cups, about 6 peaches)
12 ounces blueberries (2 cups)
3 tablespoons fresh lemon juice (from 1 lemon)
1 homemade or store-bought double-crust pie dough
1 large egg, separated, white lightly beaten or veganaise/creamer blend
2 tablespoons cold unsalted butter, cut into small pieces

Preheat oven to 375 degrees. In a large bowl, whisk together sugar, 5 TBL tapioca, and salt. Add peaches, blueberries, and lemon juice and toss to combine; let sit 15 minutes. Lightly flour a rolling pin and work surface and roll out half the dough to a 12-inch round. Place in a 9-inch pie plate and sprinkle with a tablespoon of tapioca. Pour in fruit filling and dot with butter.

Roll out remaining dough to a 12-inch round and place over fruit filling. Trim excess and crimp edges to seal. In a small bowl, lightly beat egg yolk with 1 tablespoon cold water or use a TBL of Veganaise with a tsp of creamer. Brush top of dough with mixture of choice. With a paring knife, cut several small slits on top to vent. Set on a rimmed baking sheet and bake until crust is deep golden brown and juices are bubbling, about 60 minutes. (Tent loosely with foil if crust browns too quickly.) Let pie cool completely on a wire rack, about 3 hours.

Based on a Martha Stewart Recipe. Altered slightly to accommodate my modified diet.