Rome has a very ancient culinary tradition and my favorite part is its street food. It would be worth a visit just for this!
This is not a typical product of Rome but of a northern region called Emilia Romagna.
I include it in this list because you can find it in Rome as well and it is super yummy!
Pizza with mortadella is typical of Rome.
Or any other kind of pizza!
They might not to be the best in the world (for those you definitely need to visit Sicily!) but they are not even the worse.