Wet your hands, push a piece of mozzarella into the centre of each meatball, then re-form the meat into a ball.
Place on a baking tray and cook for 15-20 mins until theyre browned and cooked through.
Meanwhile, tip the sauce into a pan. Gently heat, letting it bubble and reduce a little. Once the meatballs are cooked, pop a mini skewer in each one and serve with the sauce to dip.
