Steps
1. Mix the brewed coffee and coffee liqueur in a shallow dish.
2. Quickly dip each ladyfinger into the coffee mixture, ensuring they are soaked but not soggy.
3. In a bowl, whisk the egg yolk and sugar until pale and creamy.
4. Gently fold the mascarpone cheese into the egg yolk mixture until smooth.
5. In a separate bowl, whip the heavy cream until soft peaks form, then fold it into the mascarpone mixture.
6. Layer half of the soaked ladyfingers in a serving dish.
7. Spread half of the mascarpone cream over the ladyfingers.
8. Repeat with the remaining ladyfingers and cream.
9. Cover and refrigerate for at least 3 hours to set.
10. Before serving, dust the top with unsweetened cocoa powder.