Steps
1. Brew strong espresso and allow it to cool completely.
2. Mix espresso with coffee liqueur in a shallow dish.
3. Dip ladyfingers quickly into the coffee mixture and arrange them in a small glass or dish.
4. In a bowl, whisk mascarpone, powdered sugar, and heavy cream until smooth and creamy.
5. Spread half of the mascarpone mixture evenly over the soaked ladyfingers.
6. Repeat dipping ladyfingers and layering them on top.
7. Finish with the remaining mascarpone cream.
8. Dust the top generously with cocoa powder using a fine sieve.
9. Refrigerate for at least 2 hours before serving to let flavors meld.