In-N-Out says Animal Style burger started with a 1960s customer request

Key Points:

• In-N-Out Burger, famous for its simple menu, began officially listing popular off-menu items like the Animal Style burger online by 2005, catering to customer customization requests dating back to the 1960s.
• The Animal Style burger features a mustard-cooked beef patty, grilled onions, extra spread, pickles, and fresh lettuce and tomato, originating from a customer's special order observed by an employee.
• Other popular off-menu options include the Double-Meat, 3x3, 4x4, Grilled Cheese, and Protein Style, showcasing the chain’s commitment to fresh, made-to-order meals tailored to customer preferences.
• Founded in 1948 as California’s first drive-thru hamburger stand, In-N-Out remains family-owned with over 400 locations across 10 states, maintaining a loyal customer base familiar with its "secret" menu.
• Despite being widely known for years, the Animal Style burger continues to attract new fans, with many customers discovering and sharing their enthusiasm for the off-menu offerings on social media platforms.