In a somewhat flawed test -- e.g. part of the In-N-Out burger package was confiscated by airport security -- the Shake Shack beat Five Guys and In-N-Out in a Serious Eats taste test.
Clearly the In-N-Out burgers making their trans-continental trip by plane would be at a disadvantage to the made-fresh-in-the-same-city burgers from Five Guys and Shake Shack, so in order to compensate for this, we made the decision to handicap all three burgers by the same amount. After a careful synchronization of watches, burgers were ordered from their respective establishments at precisely 1 a.m. Greenwich Mean Time (that's 9 p.m. EST, 6 p.m. Pacific) and not tasted until the following morning.
I used to be a big In-N-Out fan (their burger is still a great fast food burger), but the slightly more upscale Shack Burger is my favorite burger in the whole wide world...it is indeed, as the article states, "a marvel of beefy engineering".
Kenji from Serious Eats went to In-N-Out, found a willing employee accomplice ("Awesome! I've been waiting for this day ever since I started working here!"), and proceeded to order one of everything off of the menu, the well-known secret menu, and the not-so-well-known super secret menu.
That should make you feel better about yourself when you tuck into the meat and cheese fest known as the Flying Dutchman -- the ultimate Atkins-friendly menu item. Two slices of cheese melted between two burger patties. No rabbit food, no wimpy buns, just pure protein and fat. Want to kick up the manliness by yet another factor? Ask for a Flying Dutchman Animal Style and they'll add a scoop of diced onions to the cheese. Pickles and spread will come on the side, so you'll have to add them yourself. "I wish we could add the spread and pickles for you, but it's just too messy for the cooks," explained an apologetic Thomas. The result definitely wins the award for messiest menu item of all time.