<P> In the United States, the T - bone has the meat - cutting classification IMPS 1174; the porterhouse is IMPS 1173 . </P> <P> In British usage, followed in Commonwealth countries, "porterhouse" often means a UK sirloin steak (i.e. US strip steak) on the bone, i.e. without the tenderloin on the other side of T - bone . However, nowadays some British on - line butchers also offer American style porterhouse steaks . </P> <P> The origin of the term "porterhouse" is contentious, with several cities and establishments claiming to have coined it . The Oxford English Dictionary traces the etymology from proprietor Martin Morrison serving large T - bones in his Pearl Street (Manhattan) "Porter House" around 1814, while noting the lack of contemporary evidence to support the tale . This origin story gained traction in the late 19th century, but others contend a Cambridge, Massachusetts hotel and restaurant proprietor named Zachariah B. Porter lent his name to the cut of beef, and others claim the steak takes its name from various 19th Century U.S. hotels or restaurants called Porter House, such as the Porter House Hotel in Flowery Branch, Georgia . </P> <P> To cut a T - bone from butchered cattle, a lumbar vertebra is sawn in half through the vertebral column . The downward prong of the' T' is a transverse process of the vertebra, and the flesh surrounding it is the spinal muscles . The small semicircle at the top of the' T' is half of the vertebral foramen . </P>

Where does the name porterhouse steak come from
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