Spray a deep casserole dish (suitable for use on the stove) or a large saucepan with low-calorie cooking spray.
Place over a medium heat, then add the onions and cook for 10 minutes, until soft and golden. Add the garlic, and continue to cook for 1-2 minutes.
Add the peppers and cook for 5 minutes. Then add the minced beef and cook for a further 4-5 minutes, until browned.
Add the chilli powder, smoky BBQ seasoning, paprika, and cumin. Stir in, then cook for 1-2 minutes.
Lower the heat and add the chopped tomatoes, tomato puree, kidney beans, balsamic vinegar, Worcestershire sauce (or Henderson's relish), sriracha sauce, and beef stock. Stir well.
Cover with a tight-fitting lid and simmer over a low heat for 45 minutes. The chilli will be ready when the sauce is rich and thick. Then serve!