Preheat the oven to 425*F. Stir together berries and 1/2 cup sugar. Let macerate for 15 minutes on the counter. After 15 minutes have elapsed, stir in the flour.

Place 1/2 pie crust in the bottom of a 9-inch pie pan. Using a pastry brush, brush egg white onto the bottom of the pie crust. Fill with berry mixtures. Cover with other pie crust or create a lattice crust.

Whisk together the remaining egg white with the yolk. Brush onto the top of the pie. Sprinkle with 2 tablespoons of white sugar.

Bake in the oven for 15 minutes and then reduce temperature to 375 and bake for another 30-40 minutes, or until crust is golden brown.