"A blueberry-studded triple-decker cake is decorated with swirls and rosettes of frosting flavored with black raspberry jam, followed by a tumble of fresh berries...."
INGREDIENTS
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2 sticks (1 cup) unsalted butter, room temperature, cut into tablespoons, plus more for pan
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3 cups cake flour (not self-rising), plus more for pans
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1 1/4 cups whole milk
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4 large eggs, room temperature
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1 vanilla bean, seeds scraped
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15 ounces blueberries (about 2 1/2 cups)
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1 teaspoon cornstarch
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1 3/4 cups sugar
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1 tablespoon baking powder
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1 teaspoon kosher salt
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4 1/2 cups sugar
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18 large egg whites, room temperature
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3 pinches of kosher salt
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12 sticks (6 cups) unsalted butter, room temperature, cut into tablespoons
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3 teaspoons pure vanilla extract
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1 1/2 cups black raspberry jam
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Burgundy gel food color
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Blueberries, black raspberries, and blackberries