What is Blue Steak? All You Need to Know

May 23, 2023
Written by Kristy J. Norton

Blue steak, also called blue rare steak is simply the rare steak. Its done temp rests between 115°F-120°F while rare steak is done at 130°F. The best blue steaks are made from tenderloin since it’s the leanest cut of beef. It is cooked hot and fast to sear the exterior, leaving the steak’s interior virtually unexposed to heat.

As a pitmaster, I have prepared this highly-ordered menu item severally. I made my fair share of mistakes along the way before I perfected my technique. Since I have a pretty good idea of where most people go wrong, let me walk you through this.

I put together this article to air out what blue steak really is, the cuts you should use, and what you shouldn’t. Stick around to know the texture and taste of blue steak and a simple recipe to enjoy.

what is blue steak

Why is It Called Blue?

So why blue? There hasn’t been a consensus but there are 2 theories that make convincing arguments. They are:

  1. French Au Bleu Theory
  2. The Blue Sheen And Oxygenated Blood Theory

French Au Bleu

The first and most viable theory in my opinion is French Au Bleu. It refers to a popular method of cooking trout in France. An Au Bleu trout is cooked in boiling water that’s been seasoned with vinegar, immediately after slaughter without scaling.

Many restaurants went along with this wording, calling barely cooked or almost utterly raw steak ‘bleu’, thus the name.

The Blue Sheen and Oxygenated Blood

The other theory depends wholly on myoglobin. Myoglobin is a protein in the blood that’s responsible for supplying much-needed oxygen to your body.

When myoglobin is exposed to oxygen for an extended period, the iron in the muscle starts to deteriorate, turning your meat brownish.

To lengthen the shelf life of beef steaks, they are vacuum-sealed after processing and before distribution. Vacuum sealing involves drawing all the oxygen out of the packaging to create an anaerobic environment.

When myoglobin is deprived of oxygen, it turns purple. However, when oxygen is re-introduced, it regains its red color. This explains why the meat in your grocery store looks a bit purplish. It is in a vacuum.

Steaks that have been packaged using the MAP, Modified Atmosphere Packaging, will have a weaker purple hue because the process involves replacing some of the oxygen in the package with other gases.

This is another reason why it’s called a blue steak.

Which Are the Best Cuts of Meat to Cook Blue Steak With?

Before you get to the cooking part, you must know how to pick out the best cut of meat for your blue steak recipe. Make no mistake, if you pick wrong, you won’t enjoy it.

The best cut of meat for blue steak is tenderloin steak since it’s very lean. Here are my top picks for the best cuts for blue steak:


The tenderloin cut is also known as fillet, filet mignon, or eye fillet depending on where you come from.

It’s the leanest cut of beef and is cut from the loin of a steer. These muscles hardly get any exercise, making it a very soft and tender cut. It is the perfect cut for cooking blue steak.

Sliced Beef Tenderloin

Flat Iron Steaks

Considered the second-leanest beef cut, flat iron steaks are cut from the chuck area of a steer. 

Recent innovations in the grilling world have made it possible to trim most of the fat off this cut, giving us the flat iron we drool over today. It’s to make both rare and medium rare steak. So, if you can’t get your hands on tenderloin, a flat iron is your next safe bet for blue steak.

Juicy Flat Iron Steak

Sirloin Tip

The sirloin tip is cut from the round cut. Since this muscle bears some weight, it’s not as tender as flat iron or tenderloin but it is still a fairly tender cut.

The sirloin steak is packed full of beefy flavor and is a good option for blue steak in the absence of flat iron and tenderloin steaks.

Related Reading

Sirloin Tip Roast

Which Steak Cuts Are Not Good for Blue Steak?

Now that you know which cuts are best for blue steak, here are the cuts you shouldn’t cook blue and why:

  • Ribeye: It has too much marbling and will taste raw after cooking.
  • T-Bone and porterhouse: They are tough beef cuts with uneven surfaces that can’t sear evenly.
  • Flat steaks: These include flank steak, hanger steak, skirt steak, and sirloin flap steak. These cuts are too chewy, thin, and tough to be cooked blue.
  • High-end steaks: Kobe and Wagyu beef have too much marbling that’s best rendered over longer cooking hours than blue steak demands.

Related Reading

At What Temperature Should I Cook Blue Steak?

The internal temperature of a done blue rare steak ranges between 115°F- 120°F. This makes it the rarest of steaks, closely followed by the usual rare steak which is considered done at 130°F.

If you take your blue steak off the heat at a temperature lower than 115, it will be raw and still cold inside. If the temperature gets past 120°F, you are serving rare steak, not blue.

Is Blue Steak Safe to Eat?

The USDA recommends cooking beef steaks to a minimum internal temp of 145°F as measured by a digital probe or meat thermometer. This applies to all steaks and roasts.

If you’re a cautious feeder, rare blue steak doesn’t make the cut. However, blue steak enthusiasts are convinced that when cooked properly, blue steaks can be safe to eat.

They argue that bacteria on steaks are only found on the surface and that these bacteria can be destroyed by searing the top and bottom as well as the sides and edges of the blue steaks. If you get the searing technique right, your blue steaks will be safe to eat.

It’s also important to sterilize the tongs you use as you cook. Don’t use the same pair of tongs to handle raw or undercooked meat and cooked meat to avoid transferring bacteria to the food you intend to consume.

Alternatively, use a different pair of tongs to take the steak out of the heat source.

How Does Blue Steak Taste?

If you’ve never had blue steak, you might be wondering how it tastes. Well, the first bite, which will include a piece of the nicely-seared bark will taste pretty much like steak.

The second bite which will largely be comprised of the ‘bleu’ region will have a bold, beefy flavor that stands out but without much moisture content compared to rare steak.

Blue steak cooking demands an incredibly short time on the skillet, leaving no time for the meat juices to move toward the meat’s surface.

You should also be prepared to transition from a warm, well-seasoned exterior to a cool, bland taste towards the center.

Blue steak, like sugarless coffee, has a unique flavor profile that’s often an acquired taste.

What is the Texture of Blue Steak?

The texture of blue steak is spongy and chewy. This texture is brought on by a lack of sufficient exposure to heat that breaks down and softens meat fibers.

With blue steak, your teeth will have to do all the tenderizing. Many steak lovers appreciate this satisfying texture.

Grilled Striploin Steak

Are Blue and Rare Steaks the Same?

Blue rare steaks are similar but not identical to rare steaks. Blue steaks are cooked for a comparatively shorter period until the internal temp gets to 115°F. Its entire outer surface is seared, while the largest part of the interior remains red.

Rare steaks are cooked longer, to an internal temperature of at least 120°F. The exterior will be well-seared just like with blue steaks. The interior will have a red section in the middle surrounded by a pink hue around the edges. The pink is an indicator that the steak has been cooked longer.

Aside from blue and rare, there is one more popular steak option that’s commonly mistaken for blue steak. It is known as Pittsburgh steak.

Pittsburgh Steak or Black and Blue Steak

It is also called Chicago-style rare or black and blue steak. The phrase, black and blue, is a reference to the cooking method which involves charring or blackening the exterior of the cut while keeping the interior red.

Today, the name Pittsburgh rare is used to reference a steak that has been charred regardless of the internal temperature.

The Go-to Blue Steak Recipe

Here is my simple delicious recipe for blue steak you can whip up on a grill or a cast iron skillet:

  • Take your tenderloin out of the fridge and season it with kosher salt on both sides.
  • Let it sit out for about 20 minutes for it to get to room temperature. This is essential, to avoid a steak that is cold at the center.
  • Meanwhile, if you are using a grill, preheat it to 425°F or higher depending on your grill. If you’re using a cast iron skillet to cook a blue steak, go for a heavy bottom one and place it on high heat.
  • If you like, you can brush it with oil. Go for high smoking point oils when searing at high temperatures. I use Happy Belly canola oil because it blends well with meat.
  • Once your cooking gear is hot, place your steak on the grates or the skillet and let it sear for no longer than a minute.
  • Using a pair of tongs, flip it over and let the other side sear as well for another minute.
  • Now, grip the cut with tongs and rotate the steak to sear the edges. Make sure every portion is sufficiently seared
  • Using a meat thermometer, check for an internal temperature of 115°F. At this temperature, blue steak is done.
  • Remove from heat and let the steak rest for around 3 minutes. Resting is essential for safety and quality. It also allows the meat’s juices to be redistributed.
  • Serve, enjoy!
Roast Beef Tenderloin Meal


What is the Rarest Steak Called?

The hardest steak to find is Wagyu steak which is why it’s highly priced.

Is Blue Steak Healthier?

There is no proof that eating blue steak is healthier than eating other steaks.

Is a Blue Steak Cold in the Middle?

Blue steak won’t be cold in the middle, nor hot. It will feel warm to the touch.

By Kristy J. Norton
I'm Kristy – a chef and connoisseur of all things BBQ! You can find me either in my kitchen (or someone else's) or at a big outdoor barbecue surrounded by friends and family. In both my professional and personal life I’ve picked up more than a few tips and tricks for turning out delicious food. I consider it a privilege to share it with others!
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