Step 1: Prepare the coffee, the pudding and the chantilly cream.
Step 3: in the pan, dispose one layer of biscuits, and lightly poor coffee on them with a tea spoon, cover all the layer. Add a layer of chocolate pudding, then biscuits with coffee again, then pudding again, until you have no more biscuits. (the last layer must be biscuits)
Step 5: cover the top of your cake with chantilly cream and roughly crushed hazelnuts (or slices of fruit).
Step 7: put your cake in the fridge to cool.