10 surprising things you didn't know about In-N-Out

In-N-Out was founded by newlyweds Harry and Esther Snyder. According to the chain, Harry Snyder visited the local meat and produce markets to buy fresh ingredients for his 10-foot-wide hamburger stand. Esther handled the accounting for the restaurant from their house, which was located near the stand around the corner from Baldwin Park.

While some new items have been added since 1948, the menu is still pretty similar to the original menu, offering basic fast-food items like burgers and fries.

A cheeseburger cost just five cents more, while fries cost 15 cents and bottled soft drinks ran 10 cents.

In-N-Out founder Harry Snyder invented the two-way speaker system from his own garage in 1948. The innovation allowed customers the convenience of not having to leave their cars or speak to an employee face-to-face in order to place their orders.

In 1958, In-N-Out replaced its bottled drinks with fountain service, offering customers beverages like Pepsi Cola, Nesbitt Orange, and Hires Root Beer. According to In-N-Out, a 12-ounce soda cost just 10 cents at the time.

At the time, it cost just 60 cents for the double-patty burger with two slices of cheese, lettuce, tomato, sliced onions, and the chain's signature spread.

The recipe is still the same today as it was in the 1960s: a mustard-cooked beef patty, lettuce, tomato, pickles, extra spread, and grilled onions.

Snyder is the granddaughter of In-N-Out founder Harry Snyder. Her uncle Rich Snyder ran the business for 17 years up until he died in a tragic plane crash, and Lynsi Snyder's father took over. However, he passed away due to an accidental drug overdose in 1999. Lynsi Snyder took the reigns of the family business in 2010 — though she had to work her way up to get the position.

According to Orange Coast Magazine, Snyder worked in the kitchen as a teenager, doing tasks like peeling potatoes and slicing onions.

"Of course, I would cry every time... I was really excited to work there because it was the family business. It was fun, and I thought it would make my dad happy," she told Orange Coast Magazine in 2014.

Lynsi Snyder is now potentially the youngest female billionaire in America. Forbes estimates her net worth at a whopping $4.2 billion, a chunk of which she received on her 35th birthday as a part of her inheritance.

The chain's recipe for its spread is top-secret, although it is similar in taste and consistency to a Thousand Island dressing. One copycat recipe calls for mayonnaise, ketchup, sweet pickle relish, sugar, and distilled white vinegar.

In-N-Out's "secret menu" isn't so secret, given that guests can easily order its various menu items by name. Some of the interesting menu items include a grilled cheese made with American cheese and the chain's burger buns and the "4x4," a massive burger with four burger patties.

According to People, Kim Kardashian's go-to order is a plain cheeseburger, cheese fries, and a vanilla shake. Kardashian loves the burger chain so much that on her 40th birthday, she received an In-N-Out Burger cake from a friend.

"OK, so I know this is a very belated birthday cake, but Fajer's been in France and our thing when we're together is we always go to like fancy events together where we're wearing gowns and we always ditch the event to go to In-N-Out," the reality star said on her Instagram Story.

Kylie Jenner also told Harper's Bazaar that during her first pregnancy, she ate In-N-Out "at least once a week."

Celebrity chef Gordon Ramsay says he loves the chain's Double-Double so much that he sometimes goes back for seconds.

"People think Americans are obese and burgers are bad for them — they are delicious. In-N-Out burgers were extraordinary," he told the Scottish newspaper the Sunday Mail in 2008. "I was so bad, I sat in the restaurant, had my double cheeseburger then minutes later I drove back round and got the same thing again to take away."