There is nothing quite as jaw-dropping as a massive, perfectly grilled porterhouse steak. Using simple techniques and great seasoning, you can grill a tender and delicious porterhouse steak at home.
Reading: how to grill a porterhouse steak
What is a Porterhouse Steak?
A porterhouse steak is a massive cut of beef comprising two separate muscles divided by a thin bone. The larger side of the porterhouse steak is a New York strip steak and the smaller side is a tenderloin. Most porterhouse steaks are cut very thick (at least 1.5 inches), weigh in at about 24 oz total, and can easily feed multiple people.
Porterhouse Steak vs. T-Bone
Both porterhouse and T-bones are cut from the short loin, both contain the same two cuts of meat (the New York strip and the tenderloin), so it begs the question… What is the difference between a porterhouse and a T-bone?
The biggest difference in these two cuts boils down to the size of the filet. The United States Department of Agriculture has specific guidelines regarding the size of the filet that separates the T-bone from the porterhouse.
For a T-bone to qualify as a porterhouse, the USDA states that the filet is required to be at least 1.25 inches thick. This measurement is taken from the bone to the widest point on the filet. The T-bone comes from the front portion of the short loin where the tenderloin tapers off, so the filet portion on T-bones are often very small. The Porterhouse steak is cut from the rear of the short loin where the tenderloin is the thickest. On a Porterhouse, you’ll see a sizeable portion of filet.
What is Reverse Searing?
With a thick cut of steak, like a porterhouse, my preferred method of grilling is using a technique called reverse searing. This process involves grilling the steak at a lower temperature over indirect heat and searing at the end over high heat. Reverse searing works exceptionally well with thick cuts because it allows the temperature of the steak to rise slowly. As a result, your steak will have the perfect doneness edge to edge instead of having steak that is charred on the outside and under-cooked in the middle.
How to Cook/Grill a Porterhouse Steak
The following is a guide to help you prepare for the grilling process. Full instructions will be in the recipe card below.
Here’s how to do it:
- Prepare your grill. You can use a gas grill, a charcoal grill, or a smoker. You’ll want to preheat it to 225 degrees F and have a spot on your grill where your steak can slowly come up in temperature without being exposed to any direct heat.
- Season your steak. Great steak doesn’t need much. I recommend using my Signature Beef Seasoning (the 2020 NBBQA 1st place winner in the beef seasoning category). Equal parts salt and pepper work great also!
- Cook your steak. Place your steak on the preheated, low temperature grill, over indirect heat. Close the lid and let your steak slowly rise in temperature. This step will likely take about an hour if you are hoping to end up with a medium rare steak. You want to take your steak off of the grill when it reaches 10 degrees under your desired finished temperature.
- Sear your steak. For that coveted, crispy crust, you need a sear on your steak. I recommend searing in a hot cast iron skillet with avocado oil, butter, garlic, and fresh herbs (like thyme).
- Rest your steak. Pull your steak out of the skillet and allow it to rest for at least 15 minutes before cutting the individual steaks off the bone and into slices.
How Long to Grill Porterhouse Steak
Plan on the entire reverse searing process taking about an hour and a half for a medium rare steak. One hour over indirect heat, fifteen minutes for the searing process, and fifteen minutes of steak resting. These are large steaks and you definitely don’t want to rush the cooking process and end up with over or under-cooked steaks.
Of course, the total cook time for your steaks will depend on your desired steak doneness. A rare steak will require less time on the grill and a well done steak will take quite a bit longer. I always recommend using a high quality meat thermometer when it comes to grilling steaks. With an instant read thermometer, you don’t have to guess at the interior temperature of thick steaks.
Porterhouse Steak Temperature
For a simple guide on steak temperatures and doneness, check out my Steak Temperature Guide post. It will really help ensure you end up with the steak doneness that you prefer when cooking steaks. I also have a downloadable meat temperature guide that you can print out and have handy in your kitchen. Just enter your email in the box below and I’ll email it to you.
How to Cook Porterhouse Steak in the Oven
The process for this recipe is simple to replicate in the oven with a few small modifications.
- Preheat your oven to 225 degrees F, instead of your grill.
- Place the steak onto a baking sheet and into the oven, instead of directly on the grill grates.
- Follow the searing instructions in a skillet, as written.
More Steak Recipes
If you’re a steak lover, you won’t want to miss out on some of these other steak recipes I’ve got on the site!
How to Grill Steak Marinated and Grilled Flank Steak Reverse Seared Tomahawk Steak