Prepare espresso or strong coffee.
Whisk egg yolks and sugar together until foamy.
Add mascarpone cheese to the egg yolk mixture and blend.
Whip heavy cream and gently fold it into the cheese mixture.
Dip ladyfingers in the coffee.
Lay the soaked ladyfingers in a container.
Spread a layer of cream on top.
Repeat to create layers.
Sift cocoa powder over the top as a finishing touch.
Refrigerate for at least 2 hours until set and chilled.