Put the lamb into a large bowl or strong food bag. Add the olive oil, wine, oregano, lemon zest and juice, garlic and black pepper – don’t add salt yet. Mix together so that all the lamb is completely coated, then chill and marinate for at least a few hrs or overnight. Add the garlic to the pan and fry for 1 min. Stir through the chargrilled veg, tomatoes and sugar, as well as the olives. Season. Add the meatballs back to the pan, cover and cook over a medium-low heat for 30-35 mins, stirring occasionally.