There’s no telling how long people have been preserving eggs. As one of natures most amazing sources of energy and great taste, there’s always been great interest in having them available whenever desired. Whether by brine, smoke, or chemistry, there are a bunch of ways to do it. And it’s a natural progression to go from preserving the whole egg to just focusing on the yolk, since that’s where all the really good stuff is – and if you’re going to do that, there’s nothing easier or more effective that a simple salt cure.
Egg yolks are a nutritional powerhouse. All the fat and roughly half the protein an egg possesses is in there, along with a very long list of other things – carbohydrates, amino acids, vital trace nutrients, minerals, vitamins, and yeah, a healthy shot of cholesterol, but that’s had a bad rap for far too long. Donald K. Layman, Professor Emeritus of Food Science and Nutrition at the University of Illinois has gone so far as to say that, “cutting dietary cholesterol is almost irrelevant when it comes to promoting healthy blood cholesterol levels and heart health.” While that’s not an endorsement to go off and start an all Twinkie diet, it does get eggs and a bunch of other formerly vilified foods off the hook.
There are a raft of preserved egg and yolk examples out there. The Chinese alone have been doing this for hundreds of years, exemplified by the so called Century Egg, which appeared in Hunan province during the Ming Dynasty. This, like rotten shark, is an acquired taste to say the least – They make durian seem tame – and yes, I’ve tried one, and I won’t do it again. To be fair, it’s the smell more than the taste that’s severely off-putting – think of a multi-feline cat box unchanged for weeks, and you get close.
Smoked eggs are as they sound, done either with cold or hot smoke. They too are sublime – The smoke, and as such choice of wood used, adds a lovely depth and complexity to the egg – It exemplifies egg versatility to a surprising degree.
Then there’s the brined or salt cured whole egg, which is an entirely different experience – good ones are lovely, like a really good egg with over the top concentrated richness and umami. The star of course, is the yolk.
This whole exercise begs the question – why would I want to do it? Well, you either love egg yolk or you don’t – If you don’t, go out and play – if you do, read on. Egg yolk has a savory, smooth taste absolutely brimming with umami, and they’re pretty, to boot. If we can create a version of that which intensifies the umami, and makes them instantly usable whenever the whim hits, it’s worth doing.
There’s also the transformational consideration – Great food is all about taking something common and doing uncommon things with them – When the whole process is stunningly simple, it’s that much sexier in the end run – And salt cured egg yolks are very sexy indeed. What you end up with is something that you can and will grate, with a gloriously bright yellow color. Preserved yolk tastes like buttery cheese – rich but not cloying – with a high level of umami added to whatever floats your boat – And it will, believe me – On pasta, pizza, salads, veggies, you name it, a little grating of this is stunningly good.
On to the process. It is a very simple thing, albeit there are a couple of versions, and we’ll cover both herein. As with all things simple in cooking, the first and most critical consideration is ingredient quality. If ever there’s a time to buy the freshest, most local eggs you can, this would be it. Since we’re merely concentrating that which already exists, mediocre will certainly breed mediocre. What you want is a stellar egg, one with a lovely orangish-yellow yolk, as fresh as you can get. Ditto for salt – you don’t need fancy, but you do want pure – high quality, coarse kosher or sea salt, with absolutely nothing else in it, is the key. Once you’ve got these together, do the deed the same day – It doesn’t take long, and that way you’re assured of taking full advantage of fresh stuff.
As for specific methodology, as mentioned, there are two primary schools – One uses just salt for the cure with passive secondary drying, while the other employs a salt and sugar cure coupled with mechanical drying in an oven or dehydrator. Both work fine, so it comes down to your predilection, and how fast you want to get done. Again, it’s so simple, it’s highly worth trying a batch of each and making your own comparison. From there, you can tweak whatever you like best to make it yours. Here’s the drill.
In both methods, the first step is the cure. You need a bunch of salt for this, depending on how many yolks you plan to do. Again, it’s super easy to do, so start with maybe four yolks, try out the results, then try the other method, pick your fave. To process a dozen yolks, you’ll need a pound of coarse kosher or sea salt. If you use the sugar/salt cure, it’s a 50%-50% blend of each – Use regular old cane sugar for that – Nothing fine or fancy needed. That’s the only difference in the cures.
Once you’ve chosen your cure, get an appropriately sized container big enough to hold how ever many yolks you want to process, as well as a bunch of cure. I like food storage containers with a snap fit lid for this – It’s gonna go in the fridge for a week, so it’s nice to have something that’ll stand up to daily use and exploration. Word to the wise, if you’ve got a bunch of folks in your house, tell them what you’re doing and point out the container – that can go a long way toward not having your stuff tossed or played with.
Pour an even layer of cure about 1/2″ thick into the container, then form a series of evenly spaced divots to receive how ever many yolks you’re gonna cure.
Have a second airtight container ready for your egg whites. Carefully separate yolks from whites, (You can and should freeze the whites for a future endeavor.) Slide a yolk into each little depression in the cure.
Now carefully cover the yolks with a nice, even layer of cure – Here again, you want about 1/2″ or so of cure over the tops of the yolks.
Seal up the container and slide it into the fridge, and leave it alone for a week.
Once your week is up, pull the yolks. Fill a small bowl with warm water, and have a clean piece of cheese cloth handy.
Take each yolk out of the cure, and brush excess cure off. Dip the cheese cloth into the water and use that to gently clean as much cure off of the yolks as you can – At this stage, they’re still a little tacky, which is just fine – Don’t freak out if the cleaning process is taking a bit of yolk with it, but again, be gentle.
Now comes the division between finishing steps.
If you’re going the passive route, then all you need is some more clean cheese cloth. Wrap each yolk in a hunk of that and tie it off with kitchen twine.
After that, hang it from a shelf in your fridge so that each yolk has good air flow all around it. Leave them there for at least a week, and two is better. When that’s done, you’re done, and you can go to town with them.
If you prefer the faster mechanical method, then you’ll set your oven or an adjustable dehydrator to 200° F. Put the yolks on a silicone pad or parchment if you’re using the oven, onto a rack if you’re going dehydrator. Let the yolks dry for 45 minutes. Remove from heat, allow to cool to room temp before refrigerating.
Either way you choose, the yolks, refrigerated in a non-reactive, airtight container will last at least a month, (but they won’t, ’cause you’ll scarf ’em down.)
Now, back there a ways I mentioned that you can tweak things, and you can – herbs and spices in the cure are par for the course, so have some fun, use your imagination, and let me know what you come up with, yeah?