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In-N-Out Burger is a popular American fast-food chain known for its simple menu and high-quality burgers. Founded in 1948 by Harry Snyder and Esther Snyder in Baldwin Park, California, the restaurant has maintained its commitment to using only fresh, never frozen beef patties and produce.

The core menu consists of Double-Double, Hamburger, Cheeseburger, French Fries, Drinks, and Neapolitan Shake. They also offer a variety of secret menu items, which are not listed on the official menu but can be ordered by customers who know about them.

In-N-Out Burger is famous for its signature "not-so-secret" menu items, such as Animal Style (topped with extra spread, grilled onions, and mustard), Protein Style (swapped with a low-carb lettuce wrap instead of a bun), and 4x4 (four patties and four slices of cheese).