1.Preheat oven to 180°C (160°C fan). Oil a 10cm x 21cm loaf pan. Arrange 6 slices of the prosciutto over base and long sides of the pan.
2.Combine beef, onion and breadcrumbs in a large bowl. Add the tomato, capsicum, olives and oregano; combine mixture using your hands. Season.
3.Press beef mixture into pan; cover with remaining prosciutto slices, cutting the slices to fit. Place pan on an oven tray.
4.Bake meatloaf for 50 minutes or until golden brown and cooked through.
The meatloaf can be prepared a day ahead; store, covered, in the fridge. If you like, swap the beef mince for chicken mince. Add a tablespoon of tomato paste for extra tomato flavour.