Tiramisu Cheesecake

Step 1
Preheat the oven to 350 degrees F (175 degrees C). Place a pan of water on the lowest oven rack.

Step 2
Make the crust: Crush ladyfingers into fine crumbs. Place crumbs into a bowl with melted butter and coffee-flavored liqueur; stir until evenly combined. Press into the bottom of a 9-inch springform pan.

Step 3
Make the filling: Beat cream cheese, mascarpone cheese, and sugar in a large bowl with an electric mixer until very smooth, 2 to 3 minutes. Scrape down the sides of the bowl and mix in coffee-flavored liqueur. Add flour and eggs; mix on low speed just until smooth. If batter seems too thick, mix in heavy cream. Pour batter over the crust.

Step 4
Bake on the center rack of the preheated oven until just set, 40 to 45 minutes.

Step 5
Open the oven door, turn off the heat, and leave cheesecake to cool on the center rack for 20 minutes.

Step 6
Remove from the oven, transfer to a wire rack to cool completely, about 30 more minutes.

Step 7
Refrigerate for at least 3 hours, or overnight.

Step 8
Just before serving, grate semisweet chocolate over the top.