1. Preheat barbecue to a medium heat. Place beef, spring onions, chives, egg, tomato sauce, Worcestershire sauce and chilli sauce in a bowl and mix to combine. Shape mixture into twelve patties. Top six patties with mozzarella cheese, then with remaining patties and pinch edges together to seal. Wrap a piece of bacon around each pattie and secure with a wooden toothpick or cocktail stick. Place on a plate and refrigerate for 2 hours or until patties are firm.
2. Place patties in a lightly oiled hinged wire barbecue frame and cook on barbecue grill for 10-15 minutes or until patties are cooked to your liking and cheese melts.