There is little agreement among experts on how large the tenderloin must be to differentiate a T-bone steak from porterhouse. The U.S. Department of Agriculture's Institutional Meat Purchase Specifications state that the tenderloin of a porterhouse must be at least 1.25 inches (32 mm) thick at its widest, while that of a T-bone must be at least 0.5 inches (13 mm). However steaks with a large tenderloin are often called a "T-bone" in restaurants and steakhouses despite technically being porterhouse.
Due to their large size and the fact that they contain meat from two of the most prized cuts of beef (the short loin and the tenderloin), T-bone steaks are generally considered one of the highest quality steaks, and prices at steakhouses are accordingly high. Porterhouse steaks are even more highly valued due to their larger tenderloin.
In the United States, the T-bone has the meat-cutting classification IMPS 1174; the porterhouse is IMPS 1173.
In British usage, followed in Commonwealth countries, porterhouse refers to the strip steak side of a T-bone steak, while the tenderloin side is called the fillet.
The origin of the term "porterhouse" is surprisingly 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 1914, 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 popular Porter House Hotel in Flowery Branch, Georgia. There is no known contemporary evidence that any particular establishment is related to the steak.
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.
T-bone and porterhouse steaks are suited to fast, dry heat cooking methods, such as grilling or broiling. Due to their relative lack of collagen, longer cooking times are not necessary to tenderize the meat.
The bone also conducts heat within the meat so that it cooks more evenly and prevents meat drying out and shrinking during cooking. The meat near the bone will cook more slowly than the rest of the steak, and the tenderloin will tend to reach the desired level of doneness before the strip.
Bistecca alla fiorentina, or 'beefsteak Florentine style', consists of a T-bone traditionally sourced from either
A T-bone steak being cooked on a grill |
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