Grate chocolate. Grease the form. Preheat the oven to 180 °.
Beat the butter and sugar until frothy. Separate eggs. Stir one egg yolk at a time into the butter and sugar cream. Stir in the almonds and chocolate. Beat egg whites until stiff and fold in. Pour the dough into the mold, cover the mold with aluminum foil.
Bake in the oven (center, fan 160 °) for 30 minutes.
When the cake has cooled, dust it with powdered sugar.