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1
Combine both chocolates in a medium bowl set over simmering water and heat until melted, stirring occasionally.
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2
Set aside to cool to lukewarm.
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3
In a large bowl, whip 1 cup of the cream to just beyond soft peaks but not quite stiff.
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4
Set aside, refrigerated.
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5
In a medium bowl whisk the egg yolks until smooth.
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6
Set the bowl over a pot of simmering water.
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7
Add 2 tablespoons of the Frangelico, the coffee, and melted chocolate and cook, whisking, until pale and thick and forms a ribbon.
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8
In another bowl, beat the egg whites until they form soft peaks.
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9
Add 2 tablespoons of the confectioners' sugar little by little until whites are stiff and glossy but not dry.
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10
Set aside.
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11
Using a large rubber spatula, fold in the whipped cream.
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12
Very gently fold in the egg whites.
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13
Spoon the mousse into individual bowls or festive glasses such as martini glasses, cover, and refrigerate for at least 8 hours before serving.
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14
When you are ready to serve the mousse, make the Toasted Hazelnut Cream by placing the remaining 1/2 cup of heavy cream in a medium bowl and whipping to soft peaks.
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15
Add the remaining tablespoon of confectioners' sugar, the remaining tablespoon of Frangelico, and the vanilla, and continue to whip until just stiff.
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16
Serve a healthy dollop on top of each mousse, and top with some of the toasted hazelnuts.