- Mix together the beef, onion, breadcrumbs, parmesan, parsley, salt and garlic. Form 12 meatballs. Fry in 1 tbsp oil all over until well browned.
- Cut holes in your buns. Put the browned meatballs in. Spoon over the garlic parsley butter. Spoon over the marinara then sprinkle over the mozzarella.
- Bake for 20 minutes at 180°C.