UKIAH, CA - JUNE 02:  A tall In-N-Out Burger sign can be seen from nearby Highway 101 as viewed on June 2, 2021, in Ukiah, California. Mendocino County, known for its wines, weed, hippies, laid-back lifestyle, and current drought, seems to be getting a population makeover as people who work remotely have moved to the region during the pandemic.  (Photo by George Rose/Getty Images)
Food - Drink
What Is A Mustard Burger At In-N-Out?
In-N-Out Burger is a wildly popular Southern California-based restaurant chain known for its juicy burgers, fresh-cut french fries, and superb milkshakes. Though the standard In-N-Out menu is rather simple, customers in the know are familiar with its "secret menu," which includes a special item called a mustard burger.
Nothing on In-N-Out's standard menu comes with mustard, so fans of this condiment need to request a mustard-grilled burger to get their fix. This sandwich is made by putting a beef patty on the griddle, then spreading mustard on top before flipping it so that it can seep in and imbue the browned meat with tangy flavor.
These mustard-grilled burgers also typically come with pickles, providing an extra sour kick and crunch. Another way to get a mustard-grilled patty is to order your burger in the notorious “animal style,” which comes with a mustard patty, pickles, grilled onions, and extra Thousand Island-style signature sauce.