Dissolve the dark chocolate in a bain-marie.
Whip the cream with the powder sugar.
Add the mascarpone cheese continuing to whip
Mix the mascarpone cream with the melted chocolate until you get a homogeneous mixture.
Allow cooling in the fridge for at least 3 hours to solidify the mixture.
After 3 hours, make small balls and roll them over cocoa powder, pistachio grain, or on coco rape.