INGREDIENTS
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CRUST
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2 1/2 cups flour
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1 teaspoon salt
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2 tablespoons white sugar
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1 cup unsalted butter, chilled, and cut into 1" chunks
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1/4 to 1/2 cup ice water
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FILLING
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5 cups blackberries, rinsed and patted dry (defrost and drain if frozen)
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1/2 cup plus 1 tablespoon, divided cup sugar
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1 teaspoon lemon juice
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1 teaspoon lemon zest
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1/2 teaspoon ground cinnamon
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1/4 teaspoon almond extract
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3 tablespoons quick-cooking instant tapioca
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1 egg white, lightly beaten