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Heat the oil in a large pan. Cook the onion and garlic for 5 mins until the onion has softened. Add the tomatoes and cook for 3-4 mins until softened and pulpy, then add the rice and rosemary.
Pour in half the stock and leave to cook for 10 mins or until the liquid has evaporated, stirring from time to time. Add the rest of the stock, then continue to cook for a further 5 mins.
Stir in the courgettes and peas, then cook for another 5 mins or so, stirring until the rice is tender, but the mixture is still a bit saucy. Can be frozen at this stage for up to 1 month. Season with plenty of black pepper, then add the basil and stir until wilted. Serve immediately.