"Many of the fine-quality bittersweet chocolates sold at supermarkets typically contain 50 to 60 percent cocoa solids. If you choose chocolate with a higher percentage, your mousse may be slightly denser...."
INGREDIENTS
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2 cups chilled heavy cream
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4 large egg yolks
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3 tablespoons sugar
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1 teaspoon vanilla
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7 oz fine-quality bittersweet chocolate (not unsweetened), chopped