INGREDIENTS
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Cake
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2 1/2 cups all-purpose flour
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2 teaspoons baking powder
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1/2 teaspoons baking soda
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1/2 teaspoon salt
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3/4 cup (1 1/2 sticks) butter, softened
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1 1/4 cups granulated sugar
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3 eggs
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1 1/2 teaspoons vanilla extract
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1 teaspoon lemon zest
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1 teaspoon lime zest
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1 teaspoon orange zest
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1 cup orange juice
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Filling
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1/4 cup solid vegetable shortening
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6 tablespoons butter, softened
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2 cups (about 1/2 lb.) sifted confectioners' sugar
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1/2 teaspoon lemon zest
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1/2 teaspoon orange zest
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1-2 tablespoons lime juice
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1-2 tablespoons orange liqueur (optional)
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1 jar (10 oz.) lemon curd