Place the tomatoes, red onions, red bell peppers, garlic and rosemary leaves into a roasting dish. Spray with oil spray and place into a hot (200C) oven for 30-40 minutes until soft and slightly charred.
Blend the vegetables with the hot stock in a food processor, or in a saucepan with a hand-held blender.
If wished, put the soup through a strainer to remove seeds etc
Stir in the vinegar, Worcestershire and Tabasco sauces.
Serve immediately.
Stores well overnight to be re-heated the next day.