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Season the pork, then lay a slice of prosciutto on each and secure with a cocktail stick. Put the carrots into a pan with a small glass of water, then season if you like. Bring to the boil, cover and cook for 5 mins, then add the beans and leeks. Give everything a stir and cook, covered, for 5 mins more.
Meanwhile, heat the oil in a frying pan. Add the pork and fry quickly for 2-3 mins on each side until cooked. Stir the crème fraîche into the vegetables until it is warmed through, then serve alongside the pork.