1. Pre heat oven to 180oC (350oF).
2. Heat oil in large frypan, and sauté onions and garlic.
3. Stir in beef; cook to well done.
4. Add tomatoes and other seasonings.
5. Cook briskly stirring occasionally until liquid has reduced.
6. Taste for seasoning-adjust if needed.
7. Spoon meat mixture into pawpaw shells.
8. Place shells side by side in shallow pan.
9. Place pan in centre of oven.
10. Pour in enough boiling water to come up to approx 1 of sides of pawpaw.
11. Sprinkle some grated cheese on top.
12. Bake for about 30 minutes until pawpaw shows no resistance when pierced with a skewer and top is delicately browned.
13. To serve, transfer the pawpaw shells to a large heated dish and top further with remaining cheese.