Roughly chop the raisins. Mix butter and nut nougat cream in a mixing bowl with the whisks of a hand mixer until smooth. Add vanillin sugar and rum. Stir in the eggs one after the other at the highest setting.
Mix flour, baking powder and hazelnuts and stir in 2 portions at medium speed. Stir in the brittle and raisins briefly. Grease a ring cake tin (22 cm Ø) and dust with flour. Smooth the dough in the tin. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2), in the lower third for 50-60 minutes.
Take out the cake and let it cool down for about 10 minutes. Remove the cake from the tin and turn it over onto a cake rack. Mix milk and cocoa drink powder and soak the still hot cake with it. Let the cake cool down completely. Mix icing sugar, syrup and lemon juice to a thick icing. Cover the cake with the icing and decorate with candles