Rustic Apple Walnut Pie

Rustic apple walnut pie is a free-form dessert with a tender, buttery crust and a filling of spiced apples studded with toasted walnuts. The apples soften and collapse slightly as they bake, while the crust turns golden and crisp at the edges. What makes it work is a cold dough that stays flaky, apples that are sliced thin and tossed with sugar and spice before baking, and a hot oven that sets the crust before the filling releases its juice.

Ingredients for Rustic Apple Walnut Pie

All-purpose flour and salt form the base of a tender crust, while cold butter cut into small pieces creates the flaky layers. Ice water brings the dough together without warming it. Apples are the main filling and soften as they bake, brown sugar sweetens them, and cinnamon, nutmeg, and lemon juice add warmth and brightness. Walnuts, toasted and chopped, add crunch and depth. Cornstarch thickens the apple juice that releases during baking so it does not run out of the crust. An egg mixed with water brushed on top creates a light golden sheen.

Why This Rustic Apple Walnut Pie Works

The dough is made by rubbing cold butter into flour until the mixture looks like coarse crumbs, then adding just enough ice water to bring it together. This method keeps the butter in distinct pieces rather than fully mixing it in, so when the dough bakes, those pockets of butter turn to steam and create flaky layers. The dough is chilled before use so the butter stays cold and firm.

The apples are sliced thin, tossed with brown sugar, spices, and cornstarch, then piled onto the dough. Cornstarch absorbs the liquid that the apples release as they cook, so the filling stays creamy and does not leak through the crust. The edges of the crust are folded up and over the filling, leaving the center open, which is why it is called rustic. The exposed filling browns lightly as it bakes.

A very hot oven (425°F) for the first part of baking sets the crust and starts the apples cooking before they release too much juice. The temperature is then lowered so the filling finishes cooking without the crust burning. The pie is done when the crust is deep golden and the apples are tender when pierced with a fork.

Mistakes To Avoid

Warm butter breaks the crust. If the butter is soft or the kitchen is very hot, the butter will blend into the flour instead of staying in pieces, and the baked crust will be dense and tough rather than flaky. Keep all ingredients cold and work quickly.

Skipping the cornstarch makes the pie leak. The apples release a lot of juice as they cook, and without cornstarch to thicken it, that liquid runs out onto the pan. The crust will be soggy on the bottom and the filling will be soupy.

Folding the crust up too high leaves no room for the filling to settle. The filling shrinks as the apples cook down, and if the crust is folded too far over the center, it will cave in and the edges will look uneven. Fold the crust up just enough to partially frame the filling.

Cutting the pie while it is hot makes it fall apart. The filling is still soft and the crust is still brittle when the pie comes out of the oven. Let it cool on a rack for at least 30 minutes so the filling sets and the crust can support itself.

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Ingredients

• 1 1/4 cups (156 grams) all-purpose flour
• 1/2 teaspoon salt
• 6 tablespoons (85 grams) cold unsalted butter, cut into small pieces
• 3 to 4 tablespoons ice water
• 2 pounds mixed apples (about 6 medium), peeled, cored, and sliced thin
• 1/3 cup (67 grams) brown sugar
• 1/2 teaspoon ground cinnamon
• 1/4 teaspoon ground nutmeg
• 2 tablespoons fresh lemon juice
• 1 1/2 tablespoons cornstarch
• 3/4 cup walnut pieces
• 1 large egg
• 1 tablespoon water

Step-by-step Instructions

1. Mix flour and salt in a large bowl. Add cold butter pieces and rub them between your fingers until the mixture looks like coarse crumbs with pea-sized pieces of butter still visible.
2. Add ice water a tablespoon at a time, tossing gently with a fork, until the dough just comes together. Do not overmix. Form the dough into a disk, wrap it in plastic, and refrigerate for at least 30 minutes.
3. Toast walnuts in a dry skillet over medium heat for 3 to 4 minutes, stirring often, until fragrant. Chop coarsely and set aside.
4. Toss sliced apples with brown sugar, cinnamon, nutmeg, lemon juice, and cornstarch in a large bowl. Let sit for 5 minutes so the apples start to release juice.
5. Preheat the oven to 425°F (220°C). Roll the dough out on parchment paper to a circle about 12 inches across and 1/8 inch thick. Transfer the parchment and dough to a baking sheet.
6. Pile the apple mixture in the center of the dough, leaving a 2-inch border. Scatter the toasted walnuts over the apples. Fold the edges of the dough up and over the filling, overlapping as you go and leaving the center open. The crust does not need to be perfect.
7. Whisk the egg with water and brush it over the exposed crust. Bake at 425°F for 20 minutes until the crust starts to brown.
8. Lower the oven temperature to 375°F (190°C) and bake for 30 to 35 minutes more until the crust is deep golden brown and the apples are tender when pierced with a fork at the center.
9. Cool the pie on a rack for at least 30 minutes before slicing. The filling will continue to set as it cools.