Heat oven to 180C/160C fan/gas 4. Heat the oil in a frying pan and gently fry the meatballs until they are browned all over, then tip them into a dish. Add the garlic and chilli, if using, to the leftover oil in the pan and cook it briefly along with the anchovies, if using. Fry until the anchovies almost melted, then add the courgettes and cook until any liquid they give off has evaporated. Stir in the capers, olives and passata and bring to a simmer. Add the meatballs and cook for 5 mins more, then season if needed.

Meanwhile, cook the pasta following pack instructions, drain well, then tip into an ovenproof baking dish about 25cm wide. Spoon over the meatball mixture, stir into the pasta and level the surface as much as possible. Sprinkle over the parmesan and bake for 30 mins, or until the top is browned a little and the sauce is bubbling. Rest for 5 mins before serving.