What's the fattiest steak?

Online Answer
Porterhouse/T-bone Just like the name suggests, the T-bone steak has a t-shaped bone on it and is cut from the cross-section of the short loin of a cow. It has a combination of two steaks in one.
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Cutting a T-bone The T-bone is cut from the short loin subprimal from the front portion of the larger loin primal. The short loin is home to the most tender and popular cuts of steak. The short loin is broken down further into two subprimals – the beef short loin (New York strip), and the tenderloin (filet mignon).