Prepare my pie crust recipe through step 5.

In a small bowl, stir the granulated sugar and cornstarch together. In a medium bowl, combine the blueberries and blackberries together. In a large bowl, combine the strawberries and cherries together. Stir 1/4 cup of cornstarch mixture into blueberries/blackberries. Stir remaining cornstarch mixture into strawberries/cherries. Add 1 teaspoon of lemon juice and 1/4 teaspoon of almond extract to each fruit mixture. Place in the refrigerator for a few moments as you roll out the crust.

Preheat oven to 400°F (204°C).

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-inch pie dish. Tuck it in with your fingers, making sure it is smooth. Fold the aluminum foil several times to form a 2-inch wide strip. Place into crust, dividing it into 1/3 and 2/3 sections as pictured above.

Spoon strawberry filling into large section, leaving any excess liquid in the bowl (you don’t want that in the filling—discard it). Spoon blueberry filling into smaller section. Again, discarding the excess liquid. Place the pie in the refrigerator until top design is ready.

Remove the other disc of chilled pie dough from the refrigerator. Roll the dough into a circle that is 12 inches diameter. Using a sharp knife, pastry wheel, or pizza cutter, cut 4 strips that are 2 inches wide and 6 inches long. Using your star cookie cutter, cut 12-14 stars. Re-roll any dough scraps if needed. Remove the pie from the refrigerator, remove aluminum foil strip, and add top decor to pie. Stars over the blueberries; strips over the strawberries to form an American flag design. Use a small knife to trim off excess dough on the sides. Crimp the edges with a fork or flute the edges. (Review my how to crimp and flute pie crust tutorial if you need extra help with this step.)

Lightly brush the pie crust with the egg wash mixture. Sprinkle with coarse sugar, if desired.

Place the pie onto a large baking sheet and bake for 20 minutes. Keeping the pie in the oven, turn the temperature down to 350°F (177°C) and bake for an additional 30-35 minutes. After the first 20 minutes of bake time, I place a pie crust shield on top of the pie to prevent the edges from browning too quickly.

Allow the pie to cool for 3 full hours at room temperature before serving. This time allows the filling to thicken up. Cover leftovers tightly and store in the refrigerator for up to 5 days.