The evolution of dining in Los Angeles has gone through extremes since its earliest days, and it's still constantly in flux. Many trends, some that hold true today, started here - sometimes it's a technique, a style of cuisine or a different way of doing business. Our restaurants have made an impact both here and across the country, and it goes beyond celebrity magnets like the Brown Derby or The Ivy. They've created some of America's favorite dishes, like French dips and tuna tartare. These are the game-changers that really made a culinary mark and forever changed where and how we dine out. Some of the restaurants are long gone, others have so much longevity, they are constant barometers of hospitality. Here's a look at 13 spots we think made a huge impact.