Roughly chop the chocolate. Peel, wash and grate carrots. Cream butter, salt, vanillin sugar and sugar with the whisk of the hand mixer. Stir in the eggs one by one.
Mix flour and baking powder and stir in portions. Fold in chocolate and carrots in several portions. Pour the dough evenly into a greased, flour-spread ring cake mould (2.5 litres capacity).
Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 50 minutes. Then remove from the oven, place on a cake rack and leave to cool in the mould for approx. 1 hour.
Turn out of the mould and let it cool down on the grid. Serve on a plate.