In-N-Out Burger has a famous "secret menu" that is not listed on their regular menu. It includes items like Animal Style burgers, Protein Style burgers (wrapped in lettuce instead of a bun), and grilled cheese sandwiches.
In-N-Out prides itself on using fresh, never-frozen ingredients. Their burgers are made from 100% pure beef, and their fries are made from fresh potatoes.
Despite its popularity, In-N-Out Burger is only found in a few states in the United States, primarily in California, Nevada, Arizona, Utah, Texas, and Oregon.
In-N-Out Burger keeps its menu simple, focusing on burgers, fries, and shakes. They believe in doing a few things exceptionally well rather than offering a wide variety of options.