INGREDIENTS
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1 tablespoon sour cream
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1 tablespoon fresh lemon juice (from 1 lemon)
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2 tablespoons ice water, plus more if necessary
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1 1/4 cups all-purpose flour, plus more for rolling
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Coarse salt
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⅓ cup plus 1 teaspoon granulated sugar, divided
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1 stick cold unsalted butter, cut into small pieces
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3/4 cup fresh blackberries
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3/4 cup fresh raspberries
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1 tablespoon plus 11/2 teaspoons cornstarch
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1 large egg, lightly beaten
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Fine sanding sugar, for sprinkling
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