Prepare all the ingredients (ground chocolate, 1 genoise, whipping cream).
Bring 1/4 of a litre of to a boiling point and pour on the chocolate.
Mix with a wooden spatula.
The mix becomes smoother and smoother.
Finish with a whisk to obtain a homogeneous .
Whip up 1/2 litre of whipping cream.
Combine the cooled chocolate mixture with the whipped cream.
Combine gently with a wooden spatula.
The mix must be very homogeneous.
Put a genoise disc in a cake circle. Fill up with the chocolate mix.
Equalize the surface with a spoon and smooth with a metal spatula.
Put in the fridge for a few hours.
Decoration: your choice of chocolate chips, cocoa, icing sugar, etc...
Serve with custard.