Instructions

1. Begin by melting the dark chocolate and unsalted butter together in a heatproof bowl set over a pot of simmering water. Stir continuously until the mixture is smooth and completely melted. Remove from heat and let cool slightly.
2. In a separate mixing bowl, beat the egg yolks and granulated sugar together until the mixture is pale and creamy. Stir in the vanilla extract to enhance the flavor.
3. Gradually pour the melted chocolate mixture into the egg yolk mixture, stirring continuously until the two mixtures are well combined and smooth.
4. In another bowl, using an electric mixer, beat the egg whites until stiff peaks form. This will give your mousse a light and airy texture.
5. In a large mixing bowl, whip the heavy cream until soft peaks form. Gently fold the whipped cream into the chocolate mixture, followed by the beaten egg whites. Be careful not to deflate the mixture; fold until just combined.
6. Divide the mousse evenly into serving glasses or bowls. Cover and chill in the refrigerator for at least 2 hours, or until set.
7. Before serving, garnish with chocolate shavings for an elegant touch.
8. Enjoy the decadent chocolate mousse as a standalone dessert or with fresh berries for a delightful contrast.