Use premium dark chocolate to get the restaurant-like richness and texture.
Add thandai powder to warm cream and let it steep for 10 minutes for enhanced flavor.
Avoid over or under-whipping the cream, whip only until soft peaks form.
Lightly roast cashews until golden. Fold it into mousse.
Pour mousse in cups, refrigerate for 2 hours, and garnish with leftover cashews and chocolate shavings.