INGREDIENTS
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1 1/2 cups unbleached all purpose flour
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1/4 cup plus 2 tablespoons powdered sugar
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1/4 teaspoon salt
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1 teaspoon lemon zest
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1 stick (1/2 cup) cold unsalted butter, cubed
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3 eggs
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3/4 cup sugar
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1 tablespoon flour
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1 tablespoon lemon zest
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3 tablespoons lemon juice, freshly squeezed
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1 cup sour cream
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3 tablespoons sugar
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1/2 teaspoon clear vanilla extract