Pork & Beef Mince is often quite fatty. If you have a non-stick frying pan, you can cook them without any extra oil or butter. If not non-stick, apply small amount of oil or butter in a heated frying pan over medium heat and cook the meatballs until browned all over.
*Note: Meatballs should be cooked by the time they are browned all over. If doubt, break one and check.