T-Bone Steak
T-bone steak is a single cross-section of the short loin primal containing two muscles separated by a T-shaped vertebra: the strip (longissimus dorsi) on one side and the tenderloin (psoas major) on the other. When the tenderloin portion is at least 1.25 inches / 3.2 cm wide it is officially called a porterhouse; below that, T-bone.
T-bone steak is a single cross-section of the short loin primal containing two muscles separated by a T-shaped vertebra: the strip (longissimus dorsi) on one side and the tenderloin (psoas major) on the other. When the tenderloin portion is at least 1.25 inches / 3.2 cm wide it is officially called a porterhouse; below that, T-bone.
The T-bone is the steak version of having both your favorites at once, a portion of strip steak and a portion of tenderloin, separated only by the bone. Cutting from the short loin primal, the tenderloin portion grows larger toward the rear of the loin, which is why porterhouse (the larger-tenderloin cut) comes from the back end and T-bone proper comes from the front.
The cooking challenge is real: strip and tenderloin have different ideal doneness levels. Tenderloin is best at medium-rare (54-58°C / 130-136°F) and does not benefit from extra heat; strip can take a touch more (medium-rare to medium, 54-60°C / 130-140°F) and benefits from a hard sear. Cooking them together means accepting that one half will be slightly off its ideal, most cooks favor the tenderloin and undershoot the strip slightly.
Also known as: Porterhouse (when tenderloin section is large), Bistecca alla Fiorentina (Italy, when very thick).
What good quality looks like
- A clear T-shaped bone running through the center, separating strip from tenderloin
- Tenderloin portion at least 1.25 inches / 3.2 cm wide for a true porterhouse classification
- Strip portion showing the same marbling and color markers as a standalone strip steak
- Tenderloin portion smooth, fine-grained, slightly darker red than the strip
- No gaps or pulled meat between bone and either muscle, clean butchery
How to cook it
- Position the tenderloin half away from the hottest part of the grill, its leaner texture cooks faster and overshoots easily
- Sear the strip half hot first, then move tenderloin into direct heat for the final stage
- Pull at medium-rare measured at the strip side; tenderloin will be the same or slightly more done
- Florentine method: very thick (5-7 cm / 2-3 inches), olive oil and salt only, hot grill, rare to medium-rare, eaten "al sangue"
Frequently asked
What is the difference between T-bone and porterhouse?
They are the same cut from different parts of the short loin. A porterhouse has a tenderloin portion at least 1.25 inches (3.2 cm) wide; a T-bone has a smaller tenderloin (under 1.25 inches). Porterhouse comes from the back of the loin where the tenderloin muscle is wider; T-bone comes from the front where it is narrower.
Why is the T-bone expensive?
You are paying for two premium cuts in one: a strip steak portion plus a tenderloin portion. The bone-in format is also more difficult to butcher and ship, adding cost. A porterhouse with a wide tenderloin can cost more per pound than the equivalent weight of strip and filet bought separately.
How thick should a T-bone be?
1.5 to 2 inches (4 to 5 cm) for grilling or pan-searing. The T-bone is a thicker steak by definition (the bone takes up width), and thinner cuts overcook on the strip side before the tenderloin is done. Florentine-style T-bones run 2 to 3 inches (5 to 7 cm) and need an open grill with high coals.
What grade is best for T-bone?
USDA Prime T-bone is the steakhouse standard. Choice with visible marbling on the strip side is the realistic home-cook target. Wagyu T-bones exist but the extreme strip marbling can make the cut overwhelming when paired with the leaner tenderloin, premium-tier non-Wagyu (Prime, Choice upper, KAPE 1+) is often preferred.