http://aht.seriouseats.com/archives/2011/05/the-burger-lab-building-a-better-big-mac.htmlThe Burger Lab: Building A Better Big MacPosted by J. Kenji Lopez-Alt, May 13, 2011 at 9:00 AM

So yeah, the Big Mac is an undeniable American icon, inextricably tied with our image, but that doesn't make it a good thing—after all, so are poor foreign policy and the Kardashians, right?
That said, in concept, the McDonald's Big Mac is a pretty beautiful thing. I mean, who could really say no to two all-beef patties, special sauce, lettuce, cheese, pickles, and onions, all on a sesame seed bun? And there are certain things the clown does very well—the proportions, for example. There's just the right amount of beef to cheese to sauce to onion. Even the triple-layered bun, which may look overwhelming, is made of sweet, squishy bread that melts down into practically nothing as you bite into it, neither overwhelming not getting lost in the other flavors.
But just like many great ideas squandered before they fulfill their destiny, it's in the execution that things start to go awry. Luckily, execution is precisely where you Serious Eaters can make things right. The goal this week is to build a better Big Mac by taking that great concept and fixing up everything that's wrong with it. There's certainly no shortage of Big Mac clones on the internet, but, in my humble opinion, every single one I've seen misses the boat, opting for larger patties or other such "improvements" that only really serve to throw off the proportions of a perfectly conceived sandwich.
The first step was to take a close look at the original sandwich to determine exactly what needs improving.

Two All-Beef Patties: All-beef, maybe. But it sure ain't the tasty, juicy, well-seared, well-seasoned beef that you want in your burger. We can definitely do better here.
Special Sauce: This is the key to the Big Mac—tangy and sweet, it's what takes a normal burger and turns it into a Classic. Indeed, the only way I can see improving this sauce is its texture. More on that later.
Lettuce: Shredded iceberg that usually has seen better days.
Cheese: In perhaps one of the greatest crimes against burgers, McDonald's not only places a cold slice of cheese onto the sandwich, but it gets placed under the bottom patty. WTF Ronald?
Pickles: A couple of dill chips that are nice and crispy. I could do with a couple more.
Onions: The Big Mac gets dehydrated onions that are rehydrated in the store. Decent flavor, but not quite as powerful as I'd like them to be.
Sesame Seed Bun: The one factor that I really see no way of improving. It's soft, it's slightly sweet, it's giving, it's got untoasted sesame seeds that don't overpower, it's just about everything you'd want in a burger bun. Replication will be the goal here.
With analysis complete, I moved on, tackling one element at a time.The Sauce
The Big Mac sauce has been a closely guarded secret recipe for many years. At least, that's what many on the internet will have you believe. And if you are to believe those same people, then cloning Big Mac Sauce is as simple as combining Mayonnaise (or Miracle Whip!) with ketchup, pickle relish, and a few other flavorings, making the sauce essentially a Thousand Island-type spread.
Problem is, even a cursory bit of research on the Mcdonald's website reveals that the sauce is actually nothing of the sort. Rather, it is a mayonnaise-based sauce with no ketchup or tomato to speak of consisting of:
Soybean oil, pickle relish [diced pickles, high fructose corn syrup, sugar, vinegar, corn syrup, salt, calcium chloride, xanthan gum, potassium sorbate (preservative), spice extractives, polysorbate 80], distilled vinegar, water, egg yolks, high fructose corn syrup, onion powder, mustard seed, salt, spices, propylene glycol alginate, sodium benzoate (preservative), mustard bran, sugar, garlic powder, vegetable protein (hydrolyzed corn, soy and wheat), caramel color, extractives of paprika, soy lecithin, turmeric (color), calcium disodium EDTA (protect flavor).
It's a frightening-looking list, but it's not really as bad as it seems. Calcium chloride is used to keep pickles crunchy (you'll find it in your canned tomatoes), xanthan gum and propylene glycol alginate are both thickeners derived from corn and kelp, respectively. Potassium sorbate and sodium benzoate are preservatives (we'll do without them), while disodium EDTA prevents metallic ions from reacting and affecting flavor during long-term storage (we also won't be needing that).
Essentially, it's a mix of mayonnaise, relish, and mustard
When you look at what's left, you've basically got soybean oil, pickle relish, vinegar, egg yolks, sugars (including HFCS), onion, mustard, vegetable protein, colorings, and emulsifiers. Essentially, it's a mix of mayonnaise, relish, and mustard with sugar, onion, turmeric colorings, and a bit of hydrolyzed vegetable protein thrown in. It's this last bit that might throw you for a bit of a loop.
Hydrolyzed vegetable protein is made by breaking down proteins into their constituent amino acids, resulting in a product with a distinctly savory flavor. Indeed, it's very similar to bottled yeast extracts (which are made by autolyzing yeast) such as Marmite, Vegemite, or Maggi seasoning. Any of those will do.

For the onions, rather than using powdered or dehydrated onions, I found that I got better flavor out of simply grating fresh onion on a Microplane grater. Combining this with the remaining elements and fiddling with the ratios got me a sauce that taste-wise was almost identical to the Mac sauce, though it lacked the characteristic pinkish hue, no doubt from the caramel color. No worries—I could live with yellowish sauce.
As for the thickeners, I also gave them a miss. My theory is that McDonald's only thickens their sauce so much in order to make sure it doesn't drip onto Drive-thru customer's laps on the freeway. I, on the other hand, like my burgers like I don't like my ice-cream cones: drippy.
The Bun
The key characteristic when it comes to the Big Mac bun is the center "Club" layer, consisting of a single circular piece of bread with crumb exposed on both sides. Simple enough. All you've got to do is use a very sharp knife to cut the very bottom off of the bottom half of a regular bun. Though Martin's Potato Rolls won our burger bun tasting, Sunbeam or Wonderbread seemed the natural choice for these burgers because of their diminutive size and ultra-squishy nature (I went with Wonder because my local supermarket doesn't carry Sunbeam).
Problem is, neither of these brands have sesame seeds, which means that to get seeded buns, I'd have to self-apply.
Interestingly enough, if you start typing "How many sesame seeds..." into a Google search bar, the very first suggested autocomplete is "...on a Big Mac bun," and according to Answers.com, it's about 178. Now I may not have the very best vision in the world, but I call BS on this. Glancing at my bun, I'd guess there are at least twice as many.
