Why It Works
- Curing the meat with spices, salt, and curing salt gives it corned beef's characteristic flavor.
- Cooking at a temperature of about 180°F (82°C) for a long period of time ensures the brisket won't dry out or get tough.
- Allowing the brisket to cool overnight before slicing guarantees you'll be able to carve thin, presentable slices.
When most people cook corned beef brisket, what do they do? They chuck it in a pot with a bunch of cabbage, potatoes, and carrots, bring it to a boil, and let it simmer away until tender, right? And frankly, the results are tasty.
I really love corned beef. Its salty, spicy, beefy flavor always reminds me of eating a hot dog in the shape of a steak, and who wouldn't love that? But the question is, just as a well-boiled hot dog is so much better than a haphazardly boiled dog, shouldn't such a noble food as corned beef be deserving of the most exacting treatment, the most precise controls to optimize the end results?
There are two basic steps to corned beef: the rub, and the cooking. The rub consists of a mix of spices, and more importantly, the salt and nitrites that give corned beef its characteristic hammy flavor. For the past few weeks, I've been exhaustively poring over every step of the curing and cooking process in an effort to produce the absolute best corned beef ever.
I've cooked 38 pounds of beef in my tiny apartment, which is driving the dog absolutely wild. Let's see if it's been worth the effort, shall we?
The Corned Beef Rub
First, a bit of history. Despite its strong association with Ireland, corned beef historically has an extremely low consumption rate in that country. Which is not to say that they didn't produce it.
Throughout the 17th and 18th centuries, the green fields of Ireland were used to graze cattle to produce corned beef that went mainly to feeding British civilians, the British and American navies and armies (its long shelf life made it ideal for overseas journeys), and for trade with the French. The average Irishman was too poor to afford the very beef they were raising, instead relying on a diet mainly of pork and lamb.
It wasn't until the mass Irish immigration to the United States that the Irish lower class started consuming corned beef in large quantities. The cheap price of beef in the U.S., as well as the Irish's close proximity to Jewish immigrant groups (who were busy producing their own salted beef specialty—pastrami) is what drove this consumption.
To this day, very little corned beef is consumed in Ireland by the Irish. If you've got any friends hailing from Ireland (and no, your buddy from Massachusetts who puts on a green shirt, pops back a few Guinnesses, and gets rowdy in Southie once a year does not count), go on and ask 'em. Really.*
*Check out a more complete history here.
That said, the only thing that really matters to me is how the stuff tastes. The chemistry and physics of cooking have always interested me more than fiddling around with flavors. After all, flavors are a matter of preference while the interaction between sodium chloride and muscle proteins is a matter of science!
But like a good little Irish boy eating the oat puffs out of the Lucky Charms* before moving on to the marshmallows, I decided to perfect my spice blend before tackling the real meat of the matter. The main flavoring constituents of corned beef are largely derived from those used for pastrami (another artifact of the close Irish-Jew immigrant relationship): mustard, black pepper, coriander seed, allspice, and a bit of clove.
*Another thoroughly Irish dish!
On top of that, a bit of dehydrated powdered ginger seemed to work nicely, as did some fennel seeds and crushed bay leaves. Yawn.
See why flavors seem too fiddly to me? A bit of this, a little of that, blah blah blah. Here's the truth: I used these spices in this ratio because I like the way they taste. If you think you'll like things to taste the way I like them to taste, then go ahead and use the same ingredients. If not, feel free to change up those spices with whatever you'd like.
The part that can't be changed, however, is the salt.
Why Salt Is Important for Corned Beef
Salt is actually where the term "corned beef" derives from. "Corn" is the old English word* for "kernel" (see how similar they sound?). It referred to any kind of small, hard object, like a large grain of salt. Corned beef is called corned beef because of the salt "corns" used to preserve it. But how does salt affect meat?
*This is back in the day when shops still came with an extra "pe" at the end and kernels were not the bridge between applications and processing centers in modern computers.
Here's what Harold McGee has to say about salt-cured hams, which aside from basic taxonomy, are extraordinarily similar to corned beef:
"High salt concentrations cause the normally tightly bunched protein filaments in the muscle cells to separate into individual filaments, which are too small to scatter light: so the normally opaque muscle tissue becomes translucent. The same un-bunching also weakens the muscle fibers, while at the same time dehydration makes the tissue denser and more concentrated: hence the close but tender texture."
So it follows that the more effectively salted a piece of meat is, the more opaque it will be, and the closer and denser the texture.
I wondered: If you increase the salt concentration of the brining solution, could you more effectively corn your beef? What if I took it to the extreme, not using a brine at all, but simply salting the beef like I would a ham, then sealing it in an airless container to keep the salt tightly in contact with it at all times?
The idea is that initially, the salt should draw juices out from the beef through the action of osmosis—the tendency of liquids to move across a semipermeable barrier from areas of low salt concentration to high. Once the liquid has exited the beef, it would form a highly concentrated brine by dissolving the salt on the beef's surface.
This brine in turn would dissolve protein filaments, allowing the beef to retain more moisture, and causing it to eventually reabsorb the brine, which should gradually work its way towards the center of the meat. If all goes well, the flavorful compounds from the spices should be able to pull an Arthur Dent* and hitch along for the ride. And indeed, it works.
*Who's Arthur Dent," you say?
If you look at the photo above, you see the brisket on the left, cured in a vacuum-sealed pouch with only salt and spices, is a deeper red and more opaque than that on the right, which was cured in a bag with a regular brine (also airtight). Cooking and tasting the two pieces of beef side-by-side confirmed it: the dry-cured beef had deeper flavor penetration and superior texture to the brined beef.
Dry-curing it would be.
Why Nitrates Are Used in Cured Meats
Of course, salt ain't the only chemical involved with curing.
For centuries, people have made use of saltpeter, also known as nitrate of potash, or by its chemical name, potassium nitrate (that's a potassium atom attached to a nitrogen atom with three oxygen atoms) to help preserve meat. It's one of the primary ingredients in gunpowder, and in years past, it was carefully synthesized by soaking hay in aged human urine (or, if you preferred, collected from bat guano deposits).
Ick, right? However, its preservative powers when added to a brine are amazing.
As meat sits in a nitrate-rich brine, certain salt-friendly bacteria will transform nitrates into nitrites (a similar molecule with only two oxygen molecules attached instead of three). These nitrites not only destroy the very bacteria that created them, they also provide flavor advantages to meat.
One problem is this transformation from nitrates to nitrites by bacteria is not easily predictable, meaning it's difficult to gauge exactly how well a specific concentration of saltpeter will work in a brine. These days, synthesized nitrites are readily available, so saltpeter is rarely used in meat preservation. Sodium nitrite is what you'll find in so-called "pink salt," a mixture of sodium chloride (table salt) and sodium nitrite which is dyed pink in order for you to easily distinguish it from regular salt (you don't want to accidentally ingest too much sodium nitrite).
So how do nitrites work to preserve meat? First off, they are flavorful. They give hams and corned beef their characteristic tang. It also inhibits the growth of the few types of bacteria that are tolerant of salty environments. Finally, it helps preserve color.
We all know that meat turns from red to brown as the main muscle pigment myoglobin oxidizes and turns into metmyoglobin, a reaction catalyzed by free iron atoms in the meat, right? (I mean, who doesn't?). Well, when nitrites react with meat, they form nitric oxide (that's nitrogen with but a single oxygen molecule), which in turn bonds with the iron, thus preventing the reaction that transforms myoglobin into metmyoglobin, allowing beef (or ham) to retain its deep pink color, even when fully cooked, like in the photo below.
Interestingly enough, this is the exact same reaction that occurs with barbecued meats to form the pink smoke ring around their edges. But that's neither here nor there.
Moral of the story: You can certainly corn beef without the nitrites, but it won't taste the same, last as long, or look the same.
Now that we know exactly what corned beef is, how do we cook the darned thing?
Here's the deal: brisket is not a tender cut of meat. It contains a ton of connective tissue, all of which must be broken down before it can be easily chewed and digested. This means applying heat.
One of the most important lessons you can learn about cooking meat is that there are two basic types of reactions that occur when heat is applied: fast reactions, and slow reactions.
Tender cuts of meat like a strip steak, will undergo various physical changes depending on temperature. These changes are fast reactions, and take place almost instantly. As soon as a steak hits 150°F, you'll know its muscle fibers have contracted enough to squeeze out about 12% of its moisture, and there's no turning back.
On the other hand, the breakdown of connective tissue—mainly composed of collagen—into soft, succulent gelatin is also temperature dependent, but it takes a long time. How long? I decided to find out.
Using a sous vide device, I cooked several pieces of the same brisket at 160°F for various periods of time, starting with a mere two hours, all the way up to a full 36 hours. After cooking, I removed the sealed bags from the water oven and chilled them overnight. The next day, I opened all the bags together and transferred them to plates. Here's what I saw:
As you can see, the less I cooked the meat, the thinner the liquid exuded from the bag, clearly demonstrating that over the course of time, more and more collagen will get broken down into gelatin, which effectively thickens the cooking liquid. Cutting into and tasting each piece of beef confirmed this: the longer it cooked, the more connective tissue was broken down, and the more tender it was. This is the case not just for corned beef, but for any kind of slow-cooked meats, whether its barbecued pork ribs, or duck confit.
Of course, time is not the only factor when slow-cooking—temperature can be just as important, if not more so.
To figure to exactly how it affects texture and moisture, I cooked identical pieces of beef at 160°F, 175°F, 190°F, and 205°F, keeping track of exactly how long it took to fully tenderize the meat within each temperature range. Here's what I found:
The amount of time needed to tenderize a piece of meat seems to increase exponentially as the temperature gets lower. The beef was fully tender after 15 hours at 175°F, but took a full 36 to tenderize at 160°. Bump the temperature all the way to 205°F—that's the temperature of a simmering pot on the stovetop, more or less—and your cooking time is reduced to 3 hours.
So obviously, the best way to cook the beef is to just boil the heck out of it until tender, right?
Not so fast. Take a look at the next graph first.
In this chart, I plotted the temperature it was cooked at along with the amount of moisture the beef lost. If you remember, moisture getting squeezed out of muscle fibers due to temperature increase is a fast reaction. That means that whether I boil a piece of beef for 3 hours or 20 hours, it makes little difference to the overall moisture level. The only thing that really matters is temperature. at 160°F, about 30% of the brisket's has gone out the window. Bring it up to 190°F, and we're looking at 48% moisture loss. All the way up to 205°F, the temperature at which most people cook their beef, and we're at a whopping 53% moisture loss!
So really, to retain the maximum amount of moisture, I wanted to cook it at as low a temperature as possible. That said, tasted side-by-side, I actually preferred the slightly drier, flakier beef cooked at 175°F. It just seemed more like the corned beef I was used to. Further testing showed that for my taste, 180°F cooked for around 10 hours was just about ideal, producing meat that was simultaneously tender and succulent.
How does one maintain this ideal temperature of 180°F? Well, if you've got an immersion circulator, that's your best bet. Your second (far cheaper) option is a slow cooker. Most will maintain a temperature of around 170°F to 180°F when set to the "keep warm" setting. Use a thermometer to double check the temperature of yours, and adjust your cooking time accordingly with the graph above.
You can also use a Dutch oven set in a 200°F oven to cook your corned beef. Just place the corned brisket in a large Dutch oven, cover it with water by several inches, and bring the pot to a simmer over high heat. Remove it from heat, cover it with a lid, place in oven, and make sure to crack the lid a little. This set up will maintain a temperature of about 180°F, so you can then leave it in the oven until the brisket is completely tender, about 10 hours.
Don't have a slow cooker or a water bath? You may be able to hack it together on the stove. Just use a large volume of water in a really big pot, bring it up to 180°F, drop in your beef, cover the pot, then set the heat to the lowest possible setting. Adjust it as necessary so that the pot hovers at around 180°F for the entire cooking period. Once you've got it set at the right heat level, you should be able to leave it there relatively unattended until your beef is cooked.
And remember: if you want your beef flakier, just cook it at a higher temperature for a shorter time. Prefer it more dense and moist? Try a lower temperature for a longer time. Got it?
The only problem remaining was the vegetables. Since the pectin holding together the cell walls of potatoes, carrots, and cabbage is much tougher than the collagen in meat cells, it needs to be cooked to a higher temperature in order to soften—183°F is the magic number, a few degrees higher than I was taking my beef. This meant that I'd need to cook the vegetables separately.
But potatoes cooked in the salty, beefy liquid is one of the best parts of a St. Patrick's day boiled supper, ain't it? The solution was quite simple, and ended up killing two birds with one stone.
Trying to slice through a hot, slippery, tender brisket is like trying to gut a live fish with a plastic knife—it ain't pretty. It is far easier to allow the corned beef to cool completely (in some of its liquid, of course), then slice it when it has firmed up again.
To this end, I decided that cooking my brisket the day before was the way to go. After that, all I had to do to serve the next day was to boil the vegetables in the brisket-brine, slice the meat, reheat, and serve.
Here's the set-up I rigged to do just that:
In the pot below is the majority of the corned beef juice along with the potatoes, carrots, and cabbage—cut into thick wedges with the core still attached, per my preference. Up top is a skillet layered with sliced corned beef and a couple ladles of liquid to moisten it. By covering the skillet on the top, the beef can gently steam through as the vegetables tenderize underneath. Serve 'em all together, and nobody at the table need know that they weren't attending the same party.
My testing in order, I could finally rest confidently knowing that whether corned beef is Irish, American, Irish-American, British, Caribbean, whatever, it's one thing for certain: Frickin' delicious.
Now, does anyone know what to do with 37 pounds of leftovers?
1 whole flat or point cut beef brisket, trimmed, about 2250 grams/5 pounds
100 grams/3 1/2 ounces (about 3/4 cup) Diamond Crystal kosher salt
10 grams/.325 ounces (about 1 1/2 teaspoons) of pink salt or 7.5 grams/.25 ounces (about 2 teaspoons) saltpeter
30 grams/1 ounce (about 2 tablespoons) packed brown sugar
2 tablespoons whole black peppercorns
2 tablespoons yellow mustard seeds
2 tablespoons whole coriander seeds
1 tablespoon allspice berries
6 whole cloves
1 tablespoon ground ginger
6 bay leaves, roughly torn
2 pounds carrots, peeled and roughly chopped
2 pounds russet potatoes, peeled and roughly diced
1 whole head white or green cabbage, cut into 6 to 8 wedges (2 to 3 pounds total)
Eight days before serving, combine salt, pink salt (or saltpeter), and brown sugar in a small bowl and whisk until homogeneous. Rub evenly over every surface of brisket. Combine peppercorns, mustard, coriander, allspice, cloves, ginger, and bay leaves and sprinkle evenly over both sides of beef, pressing spices gently into the meat until they stick. Seal the beef in a vacuum sealed bag or a zipper-lock bag with all of the air pressed out of it. Place in the coldest part of the refrigerator and let rest for 7 days, flipping once a day.
To Cook in a Sous-Vide Cooker: The day before serving, remove beef from the bag and rinse off all spices under cold, running water. Pat dry with paper towels. Re-seal in a vacuum bag and cook at 180°F until tender, about 10 hours. Proceed to step 4.
To Cook in a Dutch Oven: The day before serving, remove beef from the bag and rinse off all spices under cold, running water. Pat dry with paper towels. Preheat oven to 200°F. Place brisket in large Dutch oven, cover with water by several inches, and bring to a simmer over high heat. Remove from heat, cover with lid slightly ajar, place in oven, and cook until completely tender, about 10 hours. Proceed to step 4.
Once beef is cooked, transfer to an airtight container along with cooking liquid (if cooked in a water oven, just store it in its vacuum bag). Let rest at least overnight, and up to 3 days.
The day of: transfer cooking liquid to a large saucepan or Dutch oven along with carrots, potatoes, and cabbage. Top up with water until vegetables are submerged. Slice beef thinly against the grain and fan slices out in large skillet. Add 1 cup of liquid from pot to skillet and place skillet on top of pot. Cover skillet. Bring the pot to a boil over high heat, then reduce to a simmer. Cook until vegetables are completely tender and beef is heated through, about 45 minutes. Serve immediately with hot mustard.
You can also make this recipe using store-bought corned beef. Just skip to step 2.
Make-Ahead and Storage
Corned beef can be cooked up to a week before serving. Once cooked, corned beef can be kept, well-wrapped and refrigerated, for about two weeks.