INGREDIENTS
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3 (8-ounce) cartons plain fat-free yogurt
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1 cup sugar, divided
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1/2 cup water
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2 tablespoons instant espresso or 1/4 cup instant coffee granules
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2 tablespoons Kahlúa (coffee-flavored liqueur)
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2 tablespoons skim milk
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1/2 teaspoon vanilla extract
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1 (4-ounce) carton mascarpone cheese
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2 tablespoons unsweetened cocoa
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1 ounce bittersweet chocolate, grated
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1 (10-inch) round angel food cake