The hanger steak belongs to a category of beef known as the flat steaks, which also includes the flank and skirt steaks. The hanger steak hangs (hence the name) between the rib and the loin, where it supports the diaphragm. It was originally known as a "butcher's steak" since butchers kept and enjoyed it for themselves as consumers didn't know to ask for it, but is now a somewhat standard cut of meat in supermarket meat departments. Hanger steak is best marinated and grilled and is often the type of meat found in steak tacos. Hanger steak comes from the lower belly of a heifer or steer and is comprised of a pair of muscles that make a sort of v-shape. Although there is a long inedible membrane running down the middle, hanger steak is often the tenderest cut of meat.