In a large mixing bowl, whisk the egg yolks and sugar until pale and creamy.
Gently fold in the mascarpone cheese until smooth and combined.
In a shallow dish, combine the brewed coffee and coffee liqueur.
Quickly dip each ladyfinger into the coffee mixture, ensuring they don't soak too long.
Arrange a layer of soaked ladyfingers in a rectangular dish.
Spread half of the mascarpone mixture over the ladyfingers evenly.
Repeat with another layer of soaked ladyfingers.
Top with the remaining mascarpone mixture, smoothing the surface.
Cover the dish with plastic wrap and refrigerate for at least 4 hours.
Before serving, dust with cocoa powder and add chocolate shavings if desired.