I start by chopping the chocolate into small pieces so it melts evenly. Then, I gently heat a portion of the cream until it’s just simmering and pour it over the chocolate, stirring until completely smooth. This method ensures a glossy, lump-free base for the mousse.
Next, I whisk the egg yolks with sugar until pale and creamy. Gradually, I fold them into the melted chocolate mixture along with the hazelnut spread. The mixture should be silky and thick, setting the stage for the airy mousse.
Cold cream is key here. I whip it to soft peaks using a whisk or electric mixer. I like to check that it’s not too stiff, so it blends easily without deflating the chocolate base.
Gently folding the whipped cream into the chocolate mixture is the most delicate part. I fold slowly from the bottom up, preserving all that light, airy texture. This step is crucial for a mousse that’s fluffy but still rich.
Finally, I spoon the mousse into serving cups and sprinkle toasted hazelnuts on top. After chilling for at least two hours, they’re ready to enjoy. The mousse should hold its shape but still be wonderfully creamy.