Beat the 6 egg yolks together and then gradually add the 6 tablespoons of sugar (The more you beat this the better, try getting a light lemon color). Add and mix the Mascarpone cheese. Beat the whites to firm peaks, add to the egg-cheese mix. Beat the whipping cream firm... Add it also to the mix. Your filling is ready. Brew some really strong coffee (Espresso) around, put in a soup dish and then add some Marsala (Italian sweet liquor, i guess that sherry would do) to taste. Soak ladyfinger to half, (2 at a time) then press together to remove excess coffee(The lady fingers shouldn't be too soft). Put a layer of soaked fingers in a rectangular container. Add a thick layer of cheese mix, and continue until no more mix or fingers remain. Sprinkle with powdered cocao and refrigerate for at least 6 hours before eating.