"For layers with a colorful contrast, use two different varieties of peach sorbet...."
INGREDIENTS
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1/2 cup (1 stick) unsalted butter, softened, plus more for pan
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1 1/2 cups cake flour (not self-rising)
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1/2 teaspoon baking soda
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1/4 teaspoon baking powder
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1/4 teaspoon salt
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1 cup sugar
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2 large eggs, separated
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1/2 cup buttermilk
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Vegetable-oil cooking spray
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1 1/2 pints vanilla ice cream, slightly softened
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1 1/2 pounds ripe peaches, cut into 1/2-inch pieces (about 2 1/4 cups)
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2 pints peach sorbet, slightly softened