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Make a dressing by mixing together the mustard, vinegar and honey. Spread ½ tsp over each steak and season well, reserving the remaining dressing. Tip the breadcrumbs out onto a plate and sprinkle over the lemon zest. Dip the steaks in this until coated. Heat the oil in a non-stick frying pan and, when hot, cook the lamb until crisp and cooked through, about 7 mins on each side.
Meanwhile, boil the potatoes in salted water for about 10 mins until soft, adding the broccoli for the final 5 mins of cooking. Drain and roughly mash together. Serve alongside the lamb with the leftover dressing drizzled over.