INGREDIENTS
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1 cup white sugar
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1 teaspoon baking powder
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3 cups all-purpose flour
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1 cup cold unsalted butter (2 sticks)
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1 egg
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1/4 teaspoon salt
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Zest and juice of 2 small lemons
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5 cups fresh or frozen blueberries
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1/2 cup white sugar
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4 teaspoons cornstarch