Roll out the top layer of pie dough.
Cut out the lattice or your preferred shapes.
In a small bowl, whisk together the egg and one tablespoon of water to create an egg wash.
Spread the berry mixture over the bottom crust.
Add cubed butter over the top of the berries.
Top the berries with the lattice or preferred shapes.
Brush the pastry with egg wash.
Bake at 375 degrees for approximately 50 minutes or until the crust is golden brown and the berries are nice and bubbly. You may need to cover the outer crust to prevent it from getting too brown.
Let it cool so the berry mixture can set up.
Top with vanilla ice cream and serve!