Pull the leaves off the parsley stems and chop them finely. Peel the onion and chop finely. Put the mince in a bowl and mix in the chopped parsley and onion, the rice and a good seasoning of salt and black pepper. Using wet hands, form the mixture into little balls, about the size of a small marble.
Bring the stock to the boil in a large saucepan, then drop in the meatballs. As it retur