"Baking apple pie with precooked apple pie filling is my favorite method. It prevents watery apple pie filling, inconsistent texture, and unabalanced sweetness...."
INGREDIENTS
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2 1/2 cups all-purpose flour
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1 tablespoon granulated sugar
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1 teaspoon Kosher salt
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1 cup very cold or frozen unsalted butter, cut into small cubes ((2 sticks))
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1/3 cup cold buttermilk
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4 pounds apples ((about 8-9 large apples, see note below about recommended types of apples))
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2 tablespoons cold unsalted butter, divided
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1/2 cup brown sugar
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1/4 cup granulated sugar
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1 teaspoon ground cinnamon, plus more if desired
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1/8 teaspoon ground nutmeg, plus more if desired
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1/8 teaspoon ground allspice, plus more if desired
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1/4 teaspoon salt
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Zest of 1 lemon
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2 tablespoons fresh lemon juice
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2 tablespoons cornstarch
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1 large egg
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1 tablespoon heavy cream or whole milk
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Coarse sugar or turbinado sugar ((for sprinkling))