INGREDIENTS
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3 cups all-purpose flour
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1 1/2 cups sugar, divided
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1 teaspoon baking powder
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1 teaspoon cinnamon
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1/4 teaspoon salt
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Zest and juice of one lemon, divided
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1 cup (2 sticks) cold unsalted butter, cut into 1 inch slices
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1 large egg
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2 teaspoons vanilla extract
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4 cups fresh blackberries
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4 teaspoons cornstarch