"Although the name means "half-frozen," a semifreddo is made by freezing a mousse-like custard in a mold. The result is an airy confection, which may explain the impression that it is only semifreddo...."
INGREDIENTS
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2 10-ounce packages frozen raspberries in syrup, thawed
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4 large egg whites
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1 cup powdered sugar, divided
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2 cups chilled heavy whipping cream
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1 teaspoon finely grated lemon peel
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1/8 teaspoon ground cinnamon
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1 cup coarsely crushed amaretti cookies (Italian macaroons; about 3 ounces), divided