1-First, separate the eggs when they are cold by placing the whites in a large bowl and the yolks in a small bowl. Allow the whites to come to room temperature while you gather the rest. Next, whisk the yolks until they are smooth to build a strong base.

2-Melt the chocolate and butter together in a microwave in 30-second bursts, stirring between each burst until smooth, then set aside to cool slightly. Whip the cream to stiff peaks, making sure not to overwhip for that ideal texture. Add the sugar to the egg whites and beat until firm peaks form, like a “floppy elf hat” that’s firm but not too stiff.

3-Gently fold the egg yolks into the whipped cream using a spatula, up to 8 folds it’s okay if some streaks remain. Ensure the melted chocolate is warm and runny, ideally around 40°C/104°F, then fold it into the cream-yolk mixture, up to 8 folds. Add a quarter of the beaten egg whites to the chocolate mixture and fold about 10 times to incorporate, then pour this into the remaining egg whites and fold carefully, up to 12 folds, until no white lumps are visible.

4-Divide the mousse into serving glasses or dishes and refrigerate for at least 6 hours, preferably overnight. Finally, serve garnished with whipped cream, chocolate shavings, and optionally fresh raspberries and mint. This method keeps the mousse light and airy, adapting well for dietary tweaks as needed.