Porterhouse & T-Bone Steaks in Arlington, TX

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A porterhouse is a T-bone, cut from the wide end

The two names confuse a lot of guests, so here is the short version. Both a T-bone and a porterhouse come from the short loin, where a T-shaped bone separates two muscles: the strip on one side and the tenderloin on the other. Cut from the narrow end of the loin, the tenderloin side is small, and the steak is called a T-bone. Cut from the wide end, the tenderloin side is large, and the steak is called a porterhouse.

Mercury serves the wide end. The Dry-Aged 36 oz Porterhouse at $175 is a T-bone at the size where the filet portion is a real filet, and that is why the menu does not need a separate T-bone line. If you came in searching for a T-bone in Arlington, this is the steak, with more of the tenderloin than a T-bone would give you.

Two steaks on one bone

Eating a porterhouse is eating two different steaks that were cooked together. The strip side has the tighter grain and the beefier flavor. The filet side is softer and milder. The bone in the middle holds heat and keeps both sides from drying out.

Because the strip and the tenderloin cook at different rates, the filet side finishes a little rarer than the strip side on the same steak. That is the nature of the cut rather than a mistake. Order medium-rare and you will get a medium-rare strip and a rare-to-medium-rare filet, which most porterhouse guests consider the correct result.

Dry-aged, and what that changes

The menu lists this as the only dry-aged steak. Dry aging holds beef in a controlled cold room for a period before it is cut, during which moisture leaves the meat and the flavor concentrates. The result is a denser bite and a deeper, slightly nutty taste compared with the fresh cuts on the rest of the list. Mercury does not publish the number of days, so ask your server if you want that figure. What you will notice without asking is the crust: aged beef sears harder and darker than fresh beef, and the edge of the strip side shows it.

Dry-aged beef pairs with the marrow garnish for a reason. The shallots are confited in bone marrow, which adds back richness against the concentrated, drier character of the aged meat. A sauce is optional; if you add one, Demi-Glace at $4 is the match, and the Sauce Flight at $9 lets the table compare it with Béarnaise on the filet side.

Who orders a 36 oz steak

Couples, mostly, and small tables of three. At 36 oz with the bone, the porterhouse serves two guests as a full entrée, which puts it at $87.50 per person before sides. A $25 split plate fee applies when composed entrées are divided, so ask your server how the fee is handled for a shared porterhouse when you order.

For sides, two shared plates cover two people. Whipped Potatoes at $14 and Creamed Spinach at $16 are the traditional pair with a porterhouse. Broccolini at $17 is the lighter choice. The steak for two page compares the porterhouse with the 27 oz Wagyu Long Bone Ribeye at $210, the other shared cut on the menu, and the long bone page covers that steak on its own.

Ordering the porterhouse at Mercury

The porterhouse is on the dinner menu, served every evening Monday through Saturday; it is not on the weekday lunch menu. A steak this size takes longer on the grill and needs a rest, so order it with a starter to share, such as the Land and Sea Sampler at $26 per person, and give the kitchen the time. Thirty-six ounces on the bone is not a plate to rush, and it is not a plate to order twenty minutes before you need to leave for a first pitch.

Ask for a window table when you book; the curved wall of glass on the ninth floor faces the district, and a porterhouse dinner timed to sunset, around 7 PM in October, is what the room was built for. If you are deciding between this and a ribeye or a filet, the what steak to order answer lays out the trade-offs, and the current dinner menu is at mercurychophouse.com.