In-N-Out Burger is known for its simple menu, with basic burgers, fries and shakes.Yet by 2005, the fast-food chain was listing some of its most popular off-menu orders on a "Not-So-Secret Menu" online.Among the most famous off-menu offerings is the Animal Style burger, which the company website says is a "burger of your choice with hand-leafed lettuce, tomato, a mustard-cooked beef patty; add pickle, extra spread, with grilled onions."AMERICA'S FAVORITE FAST-FOOD CHAIN NAMED: MCDONALD'S WINS HEARTS BUT NOT BEST BURGER, SURVEY SAYSIn-N-Out’s website says the restaurants accommodate special orders because they’re "all about making our customers happy" — and that’s just how the Animal Style burger got its start."We began serving the Animal Style burger in the early 1960s when a customer watched one of our associates make his own customized burger and asked for one made the same way," In-N-Out Burger chief operating officer Denny Warnick told Fox News Digital.In-N-Out's Animal Style burger (this one is a double-double) features a mustard-cooked beef patty, pickles, extra spread and grilled onions, along with lettuce and tomato.
(In-N-Out/Fox News)"The name was created there on the spot.Over the years, many of the variations in preparation for our basic menu items were given names, usually by the customers who frequently ordered their burgers that way.
The terms were merely used to describe a way of preparing an order or a menu item exactly the way a customer wanted it."CLICK HERE FOR MORE LIFESTYLE NEWSWarnick said some of those names stuck, and today many customers order from the "secret" menu."Whether a ‘secret menu’ order or not, we still cook every burger fresh-to-order, exactly how the customer wants it," he said.CLICK HERE TO DOWNLOAD THE FOX NEWS APPIn addition to Animal Style, In-N-Out includes on its off-menu list Double-Meat, with two beef patties; the 3x3, with three beef patties and three slices of American cheese; the 4x4, which is the same a...