Flat iron steak “is a cut of steak cut with the grain from the shoulder of the animal. This produces a flavorful cut that is a bit tough because it contains a gristly fascia membrane unless removed. Some restaurants offer it on their menu, often at lower price than the more popular rib-eye and strip steaks of the same grade. This is used, in some places, as a means of selling a less expensive cut from the same animal, for example Kobe beef.”- wikipedia.com
Perfect for slow cooked dishes that simmer on during long winter days.