Break the chocolate into pieces and melt them together with butter and sugar in a hot water bath. Separate eggs, beat egg white and salt until stiff. Mix the egg yolks together with almonds, flour and baking powder to a crumbly mixture. Add hot chocolate while stirring. Fold in 2 portions of beaten egg white. Pour into a small greased, breadcrumbed ring cake mould (approx. 1.1 litre capacity).
Bake in a preheated oven (electric cooker: 175 °C / fan oven: 150 °C/ gas: level 2) for approx. 45 minutes. Let the finished cake rest in the mould for about 10 minutes, then turn out of the mould and let it cool down on a cake rack. Coarsely chop the chocolate coating and melt on a hot water bath. Cover the ring cake with the hot chocolate coating, let it dry a little and then decorate it with chocolate hearts. Let the couverture dry completely. Results in 10-12 slices