9. Repeat the layers with the remaining ladyfingers and mascarpone mixture.
10. Sift a generous amount of cocoa powder over the top layer to cover it completely.
11. Cover the dish with plastic wrap and refrigerate for at least 4 hours, or preferably overnight, to allow the flavors to meld and the tiramisu to set.
12. Before serving, you can garnish with chocolate shavings or additional cocoa powder, if desired.

Enjoy your homemade tiramisu!