This is probably my favorite food made with rice.
I do it more simply than this recipe -
I make extra arborio rice some times when I am using rice for dinner.
The next day or so I make up suppli rice balls with the left over rice. I freeze them, and microwave (one minute) for snacks.
When I make the suppli, my filling is very simple - just a small cube of whole milk mozzarella. I don't fry them, so I don't use any fat but what is in the cheese.
Sometimes I make a dipping sauce, again easy - I strain a small can of crushed tomatoes, add fresh or dried basil (or parsley or oregano, whatever) and minced garlic, a little salt and pepper, probably crushed red pepper flakes.
Suppli al Telefono (aka or similar to arancini)