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Heat the oil in large deep frying pan. Add the onions, carrots, celery, courgettes and garlic. Cook for about 10 mins or until soft, adding a few splashes of water if the mixture begins to stick. Turn up the heat and add the mince. Fry for a few mins more, breaking up the mince with the back of a spoon. Stir in tomato purée, pour over the chopped tomatoes and add a can of water. Simmer for 15 mins until the sauce is thick, then season.
Meanwhile, cook the fettuccine following pack instructions.
Tip the peas into the sauce and simmer for 2 mins more until tender. Stir through the drained pasta and parsley, then serve.