There isn't a classic recipe for Tiramisu as such, as there are many varying versions both in Italy and around the world, but this is the nicest.

You will also need 6 stemmed glasses, about 7 fl oz (200 ml) capacity.

1. First put the egg yolks into a medium-sized bowl together with the sugar and beat with an electric hand whisk on high speed for about 3 minutes, or until the mixture forms a light, pale mousse. In a separate large bowl, stir the mascarpone with a wooden spoon to soften it, then gradually beat in the egg yolk mixture. Between each addition, beat well until the mixture is smooth before adding more.
2. Now wash and dry the beaters of the whisk so they are perfectly clean, then in a third separate bowl whisk the egg whites until they form soft peaks. Now lightly fold this into the mascarpone mixture and then put the bowl to one side.
3. Next, break the biscuits in half, then pour the coffee and rum into a shallow dish and then dip the sponge fingers briefly into it, turning them over – they will absorb the liquid very quickly.
4. Now simply layer the desserts by putting 3 of the soaked sponge halves into each glass, followed by a tablespoon of mascarpone mixture and a layer of chopped chocolate.
5. Repeat the whole process, putting 5 halves in next, followed by the mascarpone, finishing with a layer of chopped chocolate and a final dusting of cocoa powder.
6. Cover the glasses with clingfilm then chill in the refrigerator for several hours and serve straight from the fridge – I think it tastes better very cold.