Start by making the jam filling. In a medium saucepan over medium heat, mix the strawberries, blueberries, cornstarch, sugar, lemon juice, cinnamon and salt together.
2 cups Strawberries, ¾ cup Blueberries, 1 tablespoon Cornstarch, ¾ cup White granulated sugar, 2 tablespoon Lemon juice, ¼ teaspoon Ground cinnamon, ⅛ teaspoon Salt
Heat until the berries start to lose their juices. Once the berries are softened, use the back of your spoon to lightly marsh the berries. Cook until thickened.
Pour into a bowl and cool completely.
Take the pie dough from the fridge and let it sit for 15 minutes. Place on a lightly floured surface and use a rolling pin to roll it out slightly. Roll out 1 pie sheet at a time.
2 Sheets of Pie dough
Use a 3 inch or 3.5 inch biscuit cutter to cut the bottom part of the pies. You can roll the pie scraps once to get more circles. I got 10 pies.
Roll the next pie sheet and cut into the same circles, this will be the top of the pies. Roll each of these circles with a rolling pin, so they are slightly thinner and bigger. This will let the tops stretch over the filling.
Use a sharp knife to cut two curve lines in the middle of top circles.
Mix the egg and water together. Use a pastry brush to brush the edges of the bottom circles with egg wash. Use a tablespoon to scoop the filling on top of the bottom squares. Spread the filling over the center, but keep the edges clear.
1 Large egg, 2 teaspoon Water
Place the top circles on top. Use a fork to crimp the edges. Place the biscuit cutter over the pies and remove the extra pieces.
Coarse sugar
Preheat the oven to 400°F. Place the pies in the freezer while the oven preheats, so the pastry chills.
Brush the egg wash on top of the pies. Sprinkle the coarse sugar on top. Bake for 15-19 minutes until the pastry is golden.
Let the pies cool before eating.