INGREDIENTS
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FOR THE CAKE:
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2 1/2 cups cake flour
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1 Tablespoon baking powder
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1/2 teaspoon salt
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1 1/4 cups buttermilk
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4 large egg whites
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1 1/2 cups granulated white sugar
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2 teaspoons freshly grated lemon zest
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1/2 cup (1 stick) unsalted butter, at room temperature
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1/2 teaspoon pure lemon extract
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FOR THE BUTTERCREAM:
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1 cup granulated white sugar
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4 large egg whites
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1 1/2 cups (3 sticks) unsalted butter, at room temperature
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1/4 cup freshly squeezed lemon juice (from 2 large lemons)
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1 teaspoon vanilla extract
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FOR FINISHING:
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2/3 cup seedless raspberry preserves, stirred vigorously until spreadable
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fresh raspberries