Stir butter, sugar and egg yolks until fluffy.

Then add the ground nuts, baking powder and melted chocolate while stirring.

Finally add the egg whites.

Pour dough into a baking paper-lined baking tray and bake about 45 minutes at 175° C.

Remove dough from form and thereby leave the boundaries inside the form and crumble them afterwards.

Mix the crumbs with the grated dark chocolate, whipped cream and rum and add on top of the cake.

Sprinkle with icing sugar.