There are many arancini (or rice ball) recipes out there, many complicated, many just parmesan and chicken stock or milanese. I recreated what i got at school in Italy in grade 7. I love them and they are easy. If you have 2 cups of short grain cooked rice left over use them. Or if you have any tomato sauce and cooked short grain rice left over then just mix them together, and proceed to adding the mozzarella, dredge and cook.