Make strong filter coffee or espresso, cool a little, mix with half of the orange liqueur and set aside. Mix the yolks with 30 g of sugar, beat over steam, remove from steam and stir until cooled. Mix in crème fraîche and remaining sugar. Stir in the remaining orange liqueur. Prepare a rectangular baking dish.
Turn 10 biscotti one by one very briefly in the coffee to the other side, spread the bottom of the mold with them and spread evenly with a quarter of the cream.
Repeat this process with the remaining biscuits and the remaining cream, finishing with a layer of cream and sprinkling with grated chocolate.
Cover with cling film. Put the tiramisu in the refrigerator for at least 4 hours to set.
Tip: Use better chocolate – the better the result will taste!