This is a really easy tomato pasta ... low heat, then add the onion and garlic and gently cook until softened. Stir in the chopped tomatoes, dried red chilli flakes, balsamic vinegar and sugar.
Cover the slow cooker with its lid and cook on high for 4–5 hours or low for 6–8 hours. When ready, serve the Bolognese sauce with freshly cooked spaghetti, some grated cheese and basil ...