INGREDIENTS
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Vegetable oil, cooking spray
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10 tablespoons unsalted butter, softened
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2 1/2 cups sifted confectioners' sugar
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1 tablespoon finely grated Ruby Red grapefruit zest plus segments from 2 to 3 Ruby Red grapefruits (wider segments halved lengthwise).
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1 tablespoon Campari
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1/2 teaspoon salt
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6 eggs, room temperature, separated
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1/2 cup all-purpose flour
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1/3 cups poppy seeds, plus more for sprinkling
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1/4 cup coarsely chopped golden raisins
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White Chocolate Mousse