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INGREDIENTS
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10 oz. (2-1/4 cups) unbleached all-purpose flour
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1/2 tsp. table salt
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1/2 lb. (1 cup) unsalted butter, softened
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1 Tbs. finely grated lemon zest (from about 1 large lemon)
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1 Tbs. finely grated lime zest (from about 1 large lime)
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1-1/4 cups granulated sugar
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1 Tbs. fresh lemon juice
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1 Tbs. fresh lime juice
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1 tsp. pure vanilla extract