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Heat oven to 200C/180C fan/gas 6. Slice the tops off the tomatoes and set aside. Scoop out the insides with a teaspoon, keeping the tomatoes intact. Discard the tomato flesh, but roughly chop the tomato tops. Heat the rice following pack instructions and tip into a bowl. Mix in the chopped tomato, the pesto, three-quarters of the mozzarella, the spinach and seasoning.
Spoon the rice mixture into the tomatoes and pack tightly into a casserole dish. Sprinkle with the remaining cheese, drizzle with a little olive oil and bake for 20 mins until soft and bubbling.