Mixed Berry Pie

Mixed berry pie is a double-crust pie filled with fresh or frozen berries, thickened with cornstarch and a touch of lemon, then baked until the crust is golden and the filling bubbles at the edges. The cornstarch keeps the filling from running while the berries stay distinct and jammy. Cold butter in the crust and a hot oven give you a crisp, flaky shell that won’t turn soggy.

Ingredients for Mixed Berry Pie

All-purpose flour and salt form the dry base of the crust. Butter, kept cold, creates the flaky layers. Ice water brings it all together into dough. Blackberries, blueberries, raspberries, and strawberries are the filling, each bringing different flavors and textures. Granulated sugar sweetens the berries without overpowering them. Cornstarch absorbs the berry juices so the pie slices cleanly instead of running. Lemon juice brightens the fruit and prevents the filling from tasting flat. Egg, beaten with water, brushed on top, browns the crust and makes it shine.

Why This Mixed Berry Pie Works

Cold butter mixed into the flour creates small pockets of fat that steam during baking, leaving behind air gaps and flaky layers. The dough rests in the refrigerator so the gluten relaxes and the butter stays firm, preventing a tough, shrinking crust. A hot oven immediately sets the pastry before the filling can soak in.

Cornstarch is the key to a slice that holds together. It absorbs and thickens the berry juices as they heat, so the filling stays in the pie instead of pooling on the plate. Lemon juice adds brightness and keeps the berries from tasting one-note sweet. The egg wash browns the crust golden and seals the top against steam.

Mistakes To Avoid

Overworking the dough makes it tough and dense instead of flaky. Mix just until the flour disappears and the dough comes together in shaggy bits, then stop. A few streaks of flour are fine and actually desirable.

Skipping the second chill before baking causes the crust to shrink in the oven and the edges to brown too fast while the bottom stays pale. Refrigerate the assembled pie for at least 15 minutes so the butter stays cold and the dough relaxes.

Filling the pie with hot berries or skipping the cornstarch turns it into a runny jam that leaks out during baking and leaves you with a soggy bottom crust. Mix the berries with sugar and cornstarch and let them sit for a few minutes before filling, so the thickener can begin to absorb the juice.

Cutting into the pie while it is still warm causes it to fall apart because the filling has not set. Cool it on a wire rack for at least 3 hours, or overnight in the refrigerator, so the cornstarch thickens fully and the slices hold their shape.

As an Amazon Associate, we earn from qualifying purchases.

Ingredients

• 2 1/2 cups (315g) all-purpose flour
• 1 teaspoon salt
• 1 cup (227g) unsalted butter, cold and cubed
• 6 to 8 tablespoons ice water
• 1 1/2 cups fresh or frozen blackberries
• 1 1/2 cups fresh or frozen blueberries
• 1 cup fresh or frozen raspberries
• 1 cup fresh strawberries, hulled and halved
• 3/4 cup granulated sugar
• 3 tablespoons cornstarch
• 2 tablespoons fresh lemon juice
• 1 large egg, beaten with 1 tablespoon water

Step-by-step Instructions

1. Mix flour and salt in a large bowl. Add cold butter cubes and cut them in with a pastry cutter or your fingertips until the mixture looks like coarse sand with pea-sized bits of butter visible.
2. Add ice water 1 tablespoon at a time, tossing gently with a fork, until the dough just comes together in shaggy bits. Do not overmix. Divide in half, shape each into a disk, wrap in plastic, and refrigerate for at least 30 minutes.
3. On a floured surface, roll one disk to a 12-inch round. Transfer to the pie dish, letting the edges hang over. Refrigerate while you roll the second disk to a 10-inch round.
4. Toss blackberries, blueberries, raspberries, strawberries, sugar, cornstarch, and lemon juice in a bowl until the berries are coated and the mixture is glossy. Let sit for 5 minutes.
5. Pour the filling into the crust. Lay the top crust over the filling, trim the overhang to 1 inch all around, fold the edges under, and crimp with a fork or your fingers. Cut 4 vents in the top.
6. Brush the top crust with the egg wash. Refrigerate the assembled pie for at least 15 minutes while you heat the oven to 425°F (220°C).
7. Place the pie on a baking sheet. Bake at 425°F (220°C) for 20 minutes, until the crust is light golden.
8. Reduce the heat to 375°F (190°C) and bake for 25 to 30 minutes more, until the crust is deep golden brown and the filling bubbles out of the vents. If the edges brown too fast, tent loosely with foil.
9. Cool the pie on a wire rack for at least 3 hours, or overnight in the refrigerator, so the filling sets completely before slicing.