Heat 15 ml olive oil in a large pot, over a medium-high heat, then add the beef mince and a pinch of salt and pepper. Cook the mince until well browned, then transfer to a bowl and set aside.
Add another 15ml oil to the pan you browned the mince in and turn the heat down to medium. Add the onions and green pepper and fry gently for 5 - 6 minutes, or until softened. Add the garlic and cook for another 2 minutes.
Add the grated carrot and mushrooms then pour the mince and any juices in the bowl back into the pan. Stir in the tomatoes.
Add the KNORR Spaghetti Bolognaise Dry Cook-in-Sauce and mix well. Reduce the heat and simmer gently for 30 minutes, or until the sauce is thick and rich. Taste, then adjust the seasoning as necessary.
Cook the spaghetti according to the instructions on the packet and drain. Serve the bolognaise over the cooked spaghetti in bowls, and top with grated cheese if desired.