The supplì is a tipical roman (and more generally from Lazio) speciality. They are rice balls, with pieces of melted mozzarella inside, wrapped up with a delicate and golden fried layer. In Rome they are also known as "supplì on the phone": dividing the supplì in two parts, these two halves remain jointed together by a piece of melted mozzarella like two people can stay connected by the wires of a telephone. Basically nearly all the pizzerias in Rome make supplì and it is difficult to eat bad ones. But if you want to taste excellent ones visit Franchi, via Cola di Rienzo 200-204, Metro A, station Lepanto o Ottaviano San Pietro. This place started his activity as a salami and meat seller in 1925 and today, among great other specialities, they sell the supplì which definitely worths a stop.