1. Heat the reserved oil from the tuna in a very large saucepan. Tip in the tomatoes plus 200ml water and simmer while you cook the pasta, following pack instructions.
2. Add the broccoli for the final 3 mins, then drain, reserving some of the cooking water.
3. Heat the grill. Stir the soft cheese into the tomato sauce until melted, then mix with the pasta, broccoli and drained tuna, along with a little of the reserved cooking water if the sauce looks a bit thick. Season with salt and pepper.Tip into an ovenproof dish and sprinkle on the cheddar and crumbs. Grill, not too close to the heat, for about 4-6 mins until golden and bubbling.
4. Serve witha big side salad, if you like.