Even as this version uses lemon zest, you could try other citrus in this as well. I’m sure that orange or lime would work well, too. Don’t have a zester? I use an inexpensive yet durable one from Microplane.
Another use for the left over Mascarpone cream is to build what I call a “poor man’s tiramisu”. Using vanilla wafers, layer them in an 8×8 dish and top with the remaining cream, zest, and crumbled vanilla wafers. This is a fun, kid-friendly version as well, and is a great surprise of flavors and textures when you show up with it at a potluck. Enjoy!