Tiramisu is better the following day, so don't hesitate to make in advance and keep it in the fridge, protected from air by plastic film
. In this case it's better to add the final cocoa powder layer just before serving.
If you love chocolate, you can add a cocoa layer on each layer of cream as well as on top.
Tiramisu can be made in several flavours, afficionados will say that it is no longer a tiramisu of course, but it's really good.
Fruit tiramisu: replace coffee + Amaretto with a mix of 75% fruit coulis (fruit purée)
+ 25% sugar syrup
to get something liquid enough to soak your biscuits, and add a layer of fruit coulis on each layer of cream.
You can also change alcohol, by replacing Amaretto by Macvin du Jura for example.