TIME interviewed burger historians and experts to determine which patties made the biggest impact on the burger industry—and the world at large. Check out the 17 most influential burgers of all time HERE.
The In-N-Out Burger – Whereas McDonald’s focused on fast, In-N-Out focused on food—its signature burger, which debuted in 1948, was made from locally sourced ground beef and fresh vegetables. That approach may have prevented In-N-Out’s expansion (it has just 294 locations today, compared with McDonald’s 34,000-plus), but it certainly hasn’t dampened foodie enthusiasm: the In-N-Out burger routinely tops best-of burger lists, and has inspired the launch of other higher-end fast food chains, such as Five Guys.