Coarsely chop 100 g dark and 50 g white chocolate. Cream fat and sugar. Stir in eggs bit by bit. Add baking oil. Mix flour and baking powder and stir into the fat egg mass with the milk.
Fold in the chocolate pieces. Pour the dough into a greased ring cake tin, smooth it down and bake in a preheated oven (electric range: 175 °C/ gas: level 2) for approx. 1 hour. Melt the remaining chocolate separately in a water bath.
Cover the cooled cake with the dark chocolate and let it dry. Put the white chocolate in a freezer bag. Cut a small tip off the bag. Pull the chocolate as threads over the cake and let it dry as well.
Results in about 16 pieces.