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Put the spinach in a large colander and pour over boiling water. Once cool enough to handle, squeeze out any excess water, then season.
Tip the tomatoes into a frying pan with some seasoning and simmer for 5 mins to thicken. Add the fish and heat for 1-2 mins – it doesn’t need to be fully cooked at this point. Stir in the basil.
Heat oven to 220C/200C fan/gas 7. Divide the spinach, fish, prawns and tomato sauce between 2 gratin dishes. Mix the Parmesan, breadcrumbs and oats together and sprinkle over the top. Bake for 20 mins until golden and bubbling. Serve with cooked broccoli.