Melt the chocolate
Chop the chocolate and melt it gently using a double boiler or microwave in short bursts. Stir until smooth and glossy. Let it cool slightly—you want warm, not hot.
Whip the cream
In a cold bowl, whip the heavy cream with sugar until soft peaks form. Soft peaks, not stiff. If it looks like butter, you’ve gone too far. Rookie mistake.
Flavor the cream
Add vanilla and a pinch of salt to the whipped cream. Gently mix it in. Be kind to the cream—don’t beat it aggressively.
Combine chocolate and cream
Add a small portion of whipped cream into the melted chocolate and stir to loosen it. This step matters. Then gently fold the chocolate mixture into the remaining whipped cream.
Fold, don’t fight
Use a spatula and fold slowly until combined. Stop once there are no streaks. Overmixing kills the fluff, and we want fluff.
Chill and set
Spoon the mousse into serving glasses. Chill for at least 2 hours until set. This is the hardest part—waiting.