Trim the steaks of all visible fat. Combine the mustard, tomato paste, honey, vinegar and pepper. Spread half the marinade over one side of the steaks. 

Heat a grill, pan or barbeque to high and spray with cooking spray. Add steaks, mustard side up. Sear the steaks for 3-4 minutes, then turn over and brush the marinade over the other side. Grill for another 3-4 minutes, depending on the thickness of the steak or cook until desired. Season with salt to taste after grilling.
