It literally "hangs" from the diaphragm of the cow, hence its name. Hanger steak is ... you let it linger with those other flavors, the better. Like hanger steak, skirt steaks are best cooked ...
Hanger steak (sometimes called onlget or bavette steak) is a known for its depth of flavour and is best served very rare otherwise it will become tough. Heat a griddle pan over a high heat.