I used this recipe, using parmesan cheese instead of pecorino and adding the whole eggs to the mixture mainly because I don't really like the idea and look of an almost raw egg on the top of my plate. However, the original recipe, and probably all the italians, swear by it...
1. the freshly grated cheese really make the difference
2. be generous with the quantity of the black pepper you're gonna add- it really needs a lot!
3. eat it immediately!