INGREDIENTS
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8 tablespoons unsalted butter, cold
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1 1/3 cup + 4 tablespoon pastry flour or 1 1/3 cups (dip and sweep method) bleached all-purpose flour
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1/4 teaspoon salt
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2 1/2 to 3 1/2 tablespoons ice water
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1 1/2 teaspoon cider vinegar (optional)
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1/8 teaspoon non-aluminum baking powder (if not using, double the salt)
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1 tablespoon egg white, lightly beaten (optional)
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4 cups blueberries, rinsed and dried
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1/2 liquid cup and two tablespoons water, divided
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2 tablespoons cornstarch
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1/2 cup sugar
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2 teaspoons lemon juice
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Pinch of salt
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1 1/2 cup whipped cream (optional)