1. Pour the jar of sauce into a saucepan and set on a low heat. Leave this to gently heat up whilst you cook the meatballs.
2. To cook the meatballs, heat a frying pan over a medium heat and add the olive oil. Once hot, fry the meatballs on all sides until nicely coloured, being careful not to burn them. Transfer to the saucepan holding the sauce and continue to simmer the sauce for 10 minutes while you cook the spaghetti.
3. Bring a large saucepan of water to the boil, add a pinch of salt and cook the spaghetti according to the packet instructions. Once cooked, drain and tip into the saucepan with the meatball sauce. Mix well and serve hot.