Preparation

• Prepare either pie crust recipe through step 5.
• Stir the blueberries, sugar, flour, cornstarch, cinnamon, lemon juice, and lemon zest together in a large bowl. Mix together until it’s no longer dry and powdery; burst a few blueberries if necessary to moisten. Set filling aside as the oven preheats.
• Adjust the oven rack to the lower third position and preheat to 425°F (218°C). Place baking sheet on the bottom oven rack to catch any blueberry juices.
• On a floured work surface, roll out one of the discs of chilled dough (keep the other one in the refrigerator). Turn the dough about a quarter turn after every few rolls until you have a circle 12 inches in diameter. Carefully place the dough into a 9 x 1.5 or 2-inch round pie dish. Tuck it in with your fingers, making sure it is smooth. Pour and spread filling evenly into pie dish. Dot the pieces of butter on top of the filling. Set aside at room temperature or in the refrigerator as you assemble the top pie crust.
• Remove the other disc of chilled pie dough from the refrigerator. Roll the dough into a circle that is 12 inches diameter. Cut strips of dough for the lattice top and arrange over the filling, sealing the edges.
• Lightly brush the top and edges of the pie crust with egg wash. Sprinkle the top with coarse sugar, if using.
• Bake the pie at 425°F for 25 minutes; then reduce the oven temperature down to 375°F (190°C) and continue baking until the filling’s juices are bubbling, 40–50 more minutes.