Delight the purple-lover in your life with this extra-special purple pie, bursting with mixed berries and set within a purple crust. Why is it purple? Freeze-dried blueberries are crushed into a fine powder and mixed into the pastry dough, adding a little unexpected flavor (and a lot of unexpected color) to the final result.
2 sticks plus 5 Tablespoons Unsalted Danish Creamery Butter, cubed
¾ cup ice water, plus more if needed
Mixed Berry Filling
¾ cup granulated sugar
⅓ cup all-purpose flour
1 teaspoon quick-cooking tapioca, finely ground
½ teaspoon kosher salt
2 cups fresh blackberries
2 cups fresh raspberries
2 cups fresh blueberries
1 teaspoon lemon juice
Purple Pie Dough
Chill a food processor bowl and blade in the freezer for 10 minutes.
Add flour, blueberry powder, sugar, and salt to the chilled food processor and pulse to mix. Add butter and pulse about 15 times, or until butter is pea-sized.
Add half the water and pulse another 10 times. Add remaining ice water and pulse 10 more times. Mix in more water, if needed, a tablespoon at a time, until dough clumps together when squeezed.
Divide dough into thirds and shape into 3 thick disks. Wrap in plastic wrap and chill at least 1 hour.
Assembly
On a lightly floured surface, roll out all three disks of dough into 12-inch circles, about 1/8-inch thick. Carefully transfer one circle to a 9-inch pie dish. Press it gently into the dish, trim the edges, and refrigerate.
For the round of dough, use 1/2-inch flower cookie cutters to cut out straight rows of flowers, 1 inch apart, across the surface of the circle. Freeze this upper crust for at least 30 minutes.
Use a variety of flower cookie cutters to cut out flower decorations from the remaining round of purple. Arrange on a baking sheet and freeze for 30 minutes.
Whisk together sugar, flour, tapioca, and salt in a large bowl. Add blackberries, raspberries, blueberries, and lemon juice and mix until well combined, gently mashing some of the berries to make a textured filling.
Pour filling into pie dish and top with frozen upper crust. Let soften a few minutes, then trim around the edge to fit. Decorate the edge and top with the purple flowers.
Refrigerate pie for 30 minutes. Meanwhile, arrange a rack on the lower third position of the oven and preheat to 400°F.
Place pie on a foil-lined baking sheet and bake for 20 minutes. Reduce the temperature to 350°F and bake another 35- 45 minutes or until filling is bubbling. If upper crust is browning too quickly, cover it loosely with foil.