Heat olive oil in a large pan and fry bacon until crisp.
Olive oil, Bacon
Add onions, carrots, celery, garlic, and rosemary and sauté until softened.
Onions, Carrots, Celery, Garlic, Fresh rosemary
Add beef mince and cook until browned.
Beef mince
Stir in chopped tomatoes, tomato puree, basil, oregano, bay leaves, tomato paste, beef stock cube, and optional red chilli.
Chopped tomatoes, Tomato puree, Fresh basil, Dried oregano, Bay leaves, Tomato paste, Beef stock cube, Optional red chili
Bring to a boil, then reduce heat and simmer for 1 hour 15 minutes.
Stir in grated parmesan and season with salt and pepper.
Grated parmesan, Salt and pepper
Cook spaghetti according to package instructions and serve with the bolognese sauce.
Spaghetti