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You might order “Animal-Style” every time, but do you really know all the secret menu items at In-N-Out Burger? Even the most die-hard fans probably don’t.

Lynsi Snyder, the owner and granddaughter of the Southern California-based fast food chain’s founders, has penned a new book full of history and revelations. Among them are the origins of the secret/not-so-secret menu items.

“Animal-Style,” Snyder explains, was inspired by a group of rowdy teens who used to hang out in parking lots and order their burgers with signature sauce, grilled onions, and extra pickles, and had the patty itself grilled with mustard.

Not all “secret menu” items are official, even though many are listed on the company’s website.

For example, you can have “Sport Peppers” (aka. pepperoncini) smashed into the patty.

  • In-N-Out Burger Meal
  • In-N-Out Burgers
  • George Geary, Andy Riesmeyer
  • In-N-Out Burger French Fries
  • Vegan Burger
  • George Geary, Andy Riesmeyer
  • George Geary, Andy Riesmeyer
  • George Geary, Andy Riesmeyer
  • Lynsi Snyder In N Out Book

Trying to cut back on carbs? Try the “Flying Dutchman” with two slices of cheese and two patties – and nothing else.

While a regular cheeseburger is known as a “1×1” and a double-double cheeseburger is a “2×2,” did you know you can also order a “4×4” stack of four beef patties and four slices of cheese?  

Too big? They will also cut the burger in half or into quarters for you.

If you want to get fancy with In-N-Out’s sunflower oil-soaked French fries, ask for “Light Fries” which are only fried for two minutes. Then, you have “Lemon Fries” with lemon juice squeezed on top. Or you can have them “Well Done.”

Not sure if you want a chocolate, vanilla, or strawberry milkshake? Ask for a “Side-by-Side” and mix two flavors, or get a “Neapolitan Shake” that mixes all three.

Other not-so-secret orders include “Roadkill Fries” with hamburger meat crumbled on top, “Grilled Cheese, “Animal Fries” and a “Scooby Snack,” which is just a patty in a wrapper.

We wanted to learn more about the in and outs of In-N-Out, but the restaurant’s corporate office didn’t respond to our request for an interview. Perhaps the real secrets will remain that way.