First make the dressing for the beans. Place mustard in a bowl and stir in 3 tablespoons extra virgin olive oil. Season with salt and freshly ground black pepper. Reserve.
Rub the steaks with extra virgin olive oil, then sprinkle with roughly cracked black pepper and rub this in as well. Turn over and repeat. Leave to marinate while you fry the wedges.
Place potato wedges in olive oil and deep fry until crisp and golden. Drain on kitchen paper. At the same time cook the beans in salted boiling water. Drain.
For the steaks, heat a pan to smoking. Place the steaks in the pan (no more oil needed) and cook for around 3 minutes on each side for medium rare, depending on thickness, or longer to taste. Remove from pan and leave to rest.
Sprinkle a little sea salt on wedges and pour dressing over beans and toss. To serve, place steaks on plates and add wedges and dressed beans.