Risotto balls stuffed with mozzarella, deep-fried, served with tomato sauce. These are traditional rice croquettes coming from Rome, from Lazio region in Italy. It is a finger food - when one croquette is cut into two pieces, melted mozzarella looks like telephone overhead line between two poles. Hence the name suppli al telefono. You can serve them with tomato sauce. If you can't buy good tomatoes, you can use tinned tomatoes.