Heat olive oil in a large saucepan over medium heat. Saute garlic until golden brown. Stir in beef mince, onions and green capsicum. Cook until beef is evenly brown and onions are tender. Stir in flour until smooth.
Stir in red wine, tomato puree, diced tomatoes, tomato paste, Worcestershire sauce and sugar. Season with salt, cayenne, celery salt, oregano and basil. Simmer for 3 hours. Stir in mushrooms at the end of cooking period.