Prepare the Coffee Mixture: Start by mixing the strong coffee and hazelnut syrup in a bowl. Set aside.
Layer the Ladyfingers: In a baking dish, cover the bottom with half of the ladyfingers. Brush half of the coffee mixture over the ladyfingers.
Make the Cream: In another bowl, unpack 2 1/2 packs of Giotto biscuits. Combine the mascarpone, quark, sugar, and hazelnut syrup, mixing until smooth. Fold in the whipped cream gently until combined and set aside.
Assemble the Tiramisu: Pour half of the cream mixture over the ladyfingers in the baking dish. Then, layer on more ladyfingers, pressing them down lightly. Brush with the remaining coffee mixture and pour the rest of the cream over the top.
Chill and Serve: Let the Tiramisu chill in the refrigerator for at least 2 hours. Before serving, roast the chopped hazelnuts in a pan without oil and let cool before garnishing the cake. Enjoy!