"Traditionally this dish is cooked with a filet of beef, but that can be quite expensive! So two good alternatives are either a hanger steak or a skirt steak. Hanger steaks are sometimes hard to find (although that is what most restaurants use), but the more readily available skirt steak is a good alternative. The skirt steak is part of the same cut that the hanger steak is from, just thinner. When shopping for a hanger or skirt steak, get the thickest one you can find...."