Place the cherries in a sieve and drain well. Whisk butter, sugar and vanilla sugar with the whisk of the hand mixer until creamy. Add the eggs bit by bit while stirring. Mix flour and baking powder. Sieve onto the egg-butter mixture, add advocaat and stir again. Fold in chocolate sprinkles and cherries.
Line a deep baking tray with baking paper, place the dough on it and smooth it down. Bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for 15-20 minutes. Remove from the oven and allow to cool for about 1 hour.
Roughly chop the chocolate. Bring cream to the boil in a pot. Add chocolate and coconut oil and melt while stirring occasionally. Put chocolate icing on the cake, smooth it down and let it cool down for about 30 minutes. Cut into pieces and serve.