"Note from the book: This recipe doesn't have a leavening agent, but it doesn't need one. A significantly longer creaming process adds more air to the batter, giving it the lift it needs. Don't skip this step!..."
INGREDIENTS
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1 1/2 cups (3 sticks) unsalted butter, at room temperature
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3 cups granulated white sugar
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1 teaspoon salt
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5 large eggs, at room temperature
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3 cups sifted cake flour
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1/2 cup 7UP soda, at room temperature
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1 tablespoon lemon extract
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1 cup powdered sugar
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3 tablespoons 7UP soda
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1/2 teaspoon lemon extract