INGREDIENTS
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2/3 cup butter, softened
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1/2 cup packed brown sugar
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2 1/2 cups all-purpose flour, divided
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4 teaspoons finely shredded lemon peel, divided
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6 eggs
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2 1/4 cups granulated sugar
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1/2 cup lemon juice
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3/4 teaspoon baking powder
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1/8 teaspoon ground nutmeg
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1 teaspoon finely shredded lime peel
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2 tablespoons sifted powdered sugar
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1/4 cup water
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3/4 cup sugar
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2 lemons, or 10 key limes, thinly sliced