Authentic Tiramisu is a classic Italian dessert with layers of coffee-soaked ladyfingers and creamy mascarponeu Recipe

Soak the Ladyfingers: In a shallow dish, combine the cooled coffee or espresso with the coffee liqueur (if using). Quickly dip each ladyfinger into the coffee mixture, making sure not to soak them too long to prevent them from becoming too soggy.
Assemble the Tiramisu: Arrange a layer of soaked ladyfingers in the bottom of a 9×13 inch dish. Spread half of the mascarpone mixture over the ladyfingers. Repeat with another layer of soaked ladyfingers and the remaining mascarpone mixture.
Chill: Cover the dish with plastic wrap and refrigerate for at least 4 hours, or overnight, to allow the flavors to meld and the tiramisu to set.
Serve: Before serving, dust the top of the tiramisu with unsweetened cocoa powder. Slice into squares and serve chilled.