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Cook the orzo following pack instructions. Drain, rinse under cold water, drain again and toss with half the olive oil.
Meanwhile, heat the remaining oil in a large sauté pan. Add the celery, onion and some seasoning, and cook for 8 mins until soft. Add the garlic, cook for 1 min, then tip in the cherry tomatoes and simmer for 10 mins. Add the spinach, cover with a lid to wilt the leaves, then add the orzo, olives, dill and mint. Season and serve.