Cream fat, sugar and vanillin sugar. Stir in eggs bit by bit. Add milk and rum. Flour. Mix baking powder, hazelnuts and chocolate, fold in briefly. Pour into a greased star-shaped mould (approx. 1 1/2 litres content) sprinkled with breadcrumbs and smooth it down.
Bake in the preheated oven (electric oven: 200°C / gas: level 3) for 20-25 minutes. Let cool down on a cake rack for about 10 minutes. Then turn out and let it cool down completely. Cut a small star pattern.
Lift the cake onto a plate. Place the template on top and dust the edge with icing sugar. Decorate the middle of the cake and possibly also the cake plate with stars. Makes about 12 pieces.