What is a dry aged porterhouse?

A porterhouse is a thick bone-in steak cut from the rear of the short loin — a New York strip on the wide side of the T-bone, a tenderloin on the narrow. Dry aging holds the cut in a temperature- and humidity-controlled case for 28 days or more. The water leaves, the flavor stays, and the beef takes on a deeper, more mineral, slightly funkier edge. The bark dries hard on the outside; the butcher trims it off; what reaches your kitchen is a more concentrated version of the same cut.

Why pull at 105°F when most reverse sear recipes say 115°F?

Cast iron carries more carryover than a grill. A rip-hot skillet adds 15 to 20°F to a steak in two minutes; a grill in the same window adds 10 to 15°F. Pulling at 105°F lets the cast iron do its work and still lands you at the medium-rare you wanted. If you switch to a grill finish, raise the pull to 115°F.

Can I grill instead of using cast iron?

Yes — and for a thicker porterhouse, a two-zone grill is the cleanest finish. Slow side at 225°F to 105°F, hot side over live coals for two minutes a side. The geometry of the porterhouse is awkward in a pan; an open flame handles the strip and the tenderloin more evenly. If the beach rental doesn't have a grill, the cast iron path works. Just pull at 105°F.

How many people does a porterhouse serve?

A 3-inch porterhouse weighs around 2 to 2.5 pounds on the bone and serves three to four. Cut the strip and tenderloin off the bone, slice each across the grain into thick coins, and the platter goes around the table once for steak and a second time for whoever wants more. Plan a side of potatoes and a green for the rest of the dinner — the porterhouse is the headline.

Dry Aged Porterhouse Steak

Description

A 3-inch dry-aged porterhouse, reverse seared at 225°F to 105°F internal, finished in a screaming-hot cast iron skillet for 60 seconds per side. Two cuts on one bone — strip on the wide side, tenderloin on the narrow — and a hard crust over edge-to-edge medium rare interior.

Ingredients

Scale

1 (3-inch) dry aged bone-in porterhouse steak (about 2.5-3 lb, 28-day age minimum) 2 tablespoons kosher salt (for the dry brine) 1 teaspoon Florida Pure Sea Salt Pure Flaked (for finishing) Coarsely cracked black pepper, optional, for finishing after the sear

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Instructions

Pat the porterhouse dry with paper towels.
Season the steak heavily with 2 tablespoons kosher salt on every face — strip side, tenderloin side, fat cap, around the bone.
Place the steak on a wire rack over a rimmed sheet pan. Refrigerate uncovered for 12 to 24 hours.
Remove the steak from the fridge 1 hour before cooking. Heat the oven to 225°F.
Insert a leave-in probe thermometer into the thickest part of the strip, away from the bone.
Place the porterhouse on the wire rack in the oven. Cook until the probe reads 105°F internal, about 90 to 120 minutes.
Pull the steak. Tent loosely with foil and rest 10 minutes.
While the steak rests, heat a heavy 12-inch cast iron skillet over high heat for 10 minutes — pan should be visibly smoking.
Press the porterhouse into the dry, smoking pan. Sear 60 seconds. Flip with long tongs and sear 60 seconds on the second face.
Tip the steak onto each edge for 20 to 30 seconds — bone side, then each fat cap.
Move the steak back to the cutting board. Rest 8 to 10 minutes.
Sprinkle 1 teaspoon Florida Pure Sea Salt Pure Flaked across the top. If using pepper, add a coarse grind now — never before the sear, where it would burn on the cast iron.
Run a knife along the bone to lift off the strip and tenderloin in one piece each. Slice both against the grain into 1/2-inch pieces. Serve with extra flaky salt at the table.

Notes

The probe is the recipe. A 3-inch dry-aged porterhouse is a thermometer cook, not a clock cook. Pull at 105°F when the probe reads it, regardless of minutes elapsed. Carryover from the cast iron sear and the final rest adds 18 to 25°F — final lands at 125 to 130°F medium rare.

Cast iron vs grill. If you're searing on a grill instead of cast iron, raise the pull temp to 115°F. A grill at the same time adds 10 to 15°F of carryover; cast iron adds 15 to 20°F.

Compound butter (optional). A pat of Cow's Rule Bleu Cheese & Chive Compound Butter melted onto the strip side as the steak rests is the steakhouse-plate finish. Au Poivre is the alternate.

Pepper goes ON AFTER the sear, never before. Cracked black pepper hits a smoking cast iron pan and turns acrid in seconds. Added on the cutting board after the rest it stays sharp, floral, and clean.

Prep Time: 5 mins
Cook Time: 2 hours
Category: Dinner
Method: Reverse Sear
Cuisine: American