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1.
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Bring a saucepan filled with 1-inch or so of water to a slow simmer.
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Put the chocolate in a medium heatproof bowl and set the bowl over, but not touching the water.
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Stir the chocolate occasionally until melted and smooth.
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Alternatively, put the chocolate in a medium microwave-safe bowl.
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Melt at 50 percent power in the microwave until soft, about 1 minute.
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Stir, and continue to heat until completely melted, about 1 to 2 minutes more.
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2.
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Meanwhile, whip the cream in a medium bowl until it holds soft peaks.
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Take care not to over whip the cream or the mousse will be dense.
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Cover and refrigerate while you cook the eggs.
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Whisk 2 teaspoons warm water and espresso powder together in a small bowl, if using.
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3.
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Put the egg and yolks in another heatproof bowl that also sets over the simmering water in the saucepan.
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Beat the eggs, sugar, and pinch of salt until foamy and light, about 30 seconds.
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Set the bowl over the water and whip with an electric mixer or whisk, moving in a circular motion around the bowl, until the eggs are fluffy, thick, and warm to the touch, 2 to 3 minutes.
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Remove from the heat and continue beating on high speed until thick ribbons fall from the beater when lifted over the bowl and the mixture has cooled slightly, about 3 minutes more.
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Fold in the espresso.
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(The mixture will seem loose at this point - that is ok.)
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4.
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Fold about a quarter of the chocolate into the eggs to lighten it, then fold in the rest of the chocolate.
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Finally, fold the whipped cream into the chocolate base to make a smooth light mousse.
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Pour the mousse into 4 serving dishes or wine glasses.
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Cover and refrigerate until set, about 1 hour.
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If desired, dust the tops with cocoa powder before serving.
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Calories: 529
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Total Fat: 41 grams
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Saturated Fat: 23 grams
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Total Carbohydrate: 43 grams
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Protein: 7 grams
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Sodium: 121 milligrams
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Cholesterol: 239 milligrams
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Fiber: 3 grams