Roast the hazelnuts in a pan without fat until golden brown. Remove. Coarsely chop the dark chocolate coating. Break the fat into pieces. Warm the cream (do not boil!). Dissolve coffee powder in it.
Melt chocolate coating and fat in it. Add sugar and rum and mix until smooth. Chill for 30-45 minutes. Grease a box form (approx. 25 cm long; 1 1/2 litre capacity) and line it with parchment paper. Stir the couverture mixture until smooth. Pour some couverture mixture (1-2 cm high) on the bottom of the mould. Sprinkle about 1 tablespoon of nuts over it. Place a layer of butter cookies on top. In the same way, alternately add 3 more layers of biscuits, chocolate and nuts. Put them in a cool place overnight. Carefully turn the cake over.
Sprinkle about 1 tablespoon of nuts over it. Place a layer of butter cookies on top. In the same way, alternately add 3 more layers of biscuits, chocolate and nuts. Put them in a cool place overnight. Carefully turn the cake over. Pull parchment paper from the cake. Chop white couverture and melt in a hot water bath. Cool down a little. Put it in a freezer bag and cut off a small corner. Spray white strips lengthwise on the cake. Leave to dry
Pull parchment paper from the cake. Chop white couverture and melt in a hot water bath. Cool down a little. Put it in a freezer bag and cut off a small corner. Spray white strips lengthwise on the cake. Leave to dry
waiting time approx. 18 hours