Combine the pork, garlic, thyme, cornflour, egg and some salt and pepper in a bowl and, using your hands, work together until well blended. Divide the mixture into quarters and shape into 4 even-sized patties. Chill for 30 minutes.
Spray the patties with a little oil and cook on a hot barbecue for 5—6 minutes on each side. Set aside to rest until required. Barbecue the mushrooms for 2—3 minutes on each side and the bacon for 2 minutes on each side.
Place the patties on the sesame rolls and top with the mushrooms, bacon and tomatoes and some mustard, if liked. Serve with tomato sauce.