1
In a large mixing bowl, whisk together the egg yolks and sugar until light and frothy. Mix in the mascarpone and vanilla until combined and set aside. In a clean bowl, whisk the egg whites until white and stiff. Add a large spoonful of the beaten egg whites to the egg yolk mixture and mix through. Add the rest of the egg whites and fold through gently.
2
Arrange the savoiardi di fonni or ladyfinger biscuits to the base of a trifle bowl. Soak them in the espresso and splash with a little vin santo or Marsala. Carefully spread a layer of the mascarpone mixture and sprinkle over a little of the dark chocolate shavings, then spread a few tablespoons of the caramel or dulce de leche.
3
Repeat with the rest of the ingredients, ending with a final layer of mascarpone mix. Dust with a little cocoa powder and decorate with the rest of the dark and the white chocolate shavings. Chill until ready to serve.