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Bring a pan of water to the boil, add the potatoes and celery and cook for 8 mins. Meanwhile, mix the yogurt, guerkins, caraway and mustard in a bowl. When the potatoes and celery are cooked, drain and set aside for a few mins to cool a little.
Bash the pork pieces with a rolling pin to flatten them. Sprinkle over the sage and some pepper, then top each with a slice of Parma ham. Heat the oil in a non-stick pan, add the pork and cook for a couple of mins each side, turning carefully. Add the balsamic vinegar and let it sizzle in the pan.
Stir the potatoes and celery into the dressing and serve with the pork, with some salad leaves on the side.