Flank steak is one of the "flat" steaks and is a versatile and flavorful cut of beef. The flank steak comes from the abdominal muscles or lower chest of the cow. It is often the cut used in London broil, Mexican fajitas, and Chinese stir-fried beef. The meat tends to be a deeper red color than other steaks like a N.Y. Strip or Ribeye steak. It will have long strands of muscle fiber running the entire length of the meat.