Finely grate the chocolate. Cream fat and sugar. Season with salt and vanillin sugar. Stir in the eggs one by one. Mix flour and baking powder. Alternately stir in with the milk. Fold in grated chocolate and droplets.
Pour into a greased, breadcrumbed ring cake mould (2 1/2 litres capacity). Bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 60-70 minutes. Let it cool down a little, turn out of the mould and let it cool down completely. Chop the chocolate coating separately and melt each on a hot water bath. First cover the cake with dark chocolate coating, then spread white chocolate coating in droplet form. Immediately pull through with a fork, allow to set