There are so many different variations on the classic Italian dessert. I'm not a purist and so I'm afraid to mix it up, substitute ingredients where need be. However, this recipe stays quite true to the classic. A friend once made an Earl Grey and Cointreau tiramisu as a nod to her English heritage. It was delicious, but I'm partial to the chocolate version.
Mostly, I usually substitute the lady fingers, because I have yet to find a good GF version. But it could be with a version of speculoos, some homemade crumb topping, or even an easy pound cake. In this case, it's the crumb topping.