In a bowl combine onion, garlic, vegetables and salt and pepper, to taste.
Wash the silverbeet leaves and place a handful of meat mixture onto each leaf. Roll up the leaf and tuck the edges in. Place the parcels into a large saucepan and set aside.
In a jug, mix together cream, tomatoes, water and herbs. Pour this mixture onto the little parcels. Heat until sauce boils then turn heat down and simmer for approximately 40 minutes.