Mmm, I love me some carrot cake. I had been looking forward to this recipe in particular, and I've made it many times since. It's just that good. A couple of suggestions, though. First of all, plan on the grating of the carrot. It takes a bit. If you want to purchase pre-grated carrot, you can, but grating isn't difficult. It simply takes a bit of time. In any case, it's not your usual 10-20 minute oatmeal. Count on almost a half hour, if your not used to the grating and do it slow.
Secondly, while I do love mascarpone cheese, I do not recommend using it in the frosting-like topping. I did, the first time I made this, and discovered just why cream cheese pairs so well with carrot cake, and mascarpone does not. Once I remedied this, this recipe became one of my favorites. Enjoy!