INGREDIENTS
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3 cups granulated sugar
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3 sticks (12 ounces) unsalted butter
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5 eggs
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3 cups all-purpose flour
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1/2 teaspoon salt
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1 cup lemon-lime soda, such as 7-Up
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1 tablespoon lemon zest
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1 tablespoon lime zest
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Nonstick baking spray, for spraying pan
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2 cups powdered sugar, sifted
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1 tablespoon lemon zest, dried for at least 30 minutes, plus more for sprinkling
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1 tablespoon lemon juice
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1 tablespoon lime zest, dried for at least 30 minutes, plus more for sprinkling
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1 tablespoon lime juice
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1/4 teaspoon salt
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1 cup heavy cream
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1 teaspoon granulated sugar
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Blackberries, for serving