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Boil the pasta in a pan of water for 5 mins. Add the beans and onion, return to the boil and cook for 5 mins more.
Meanwhile, put the tomatoes in a bowl with the oil, vinegar and basil (saving a couple of leaves), then blitz with a hand blender to make a dressing.
Drain the pasta and beans, tip into the dressing, add the olives and mix well. Spoon onto plates and top with the basil leaves and rocket, or pack into lunchboxes, cool, then top with the rocket and basil. Can be chilled for up to one day ahead.