In a bowl, mix the blueberries, sugar, cornstarch, cinnamon, salt, and lemon zest. Set aside.
2. Step
Preheat oven to 400°F (200˚C).
3. Step
On parchment paper, stack 2 pie crusts on top of each other. Roll out to 17 inches by 12 inches (43 cm by 30 cm). Cut diagonally into strips.
4. Step
Roll out another 2 pie crusts. Place in a 15x10x1 inch (38x25x2 cm) baking sheet.
5. Step
Spread out blueberry mixture into the crust, then form a lattice top with the pie crust strips. Tuck the crust inward around the edges, and bake for 35 minutes.
