What I meant was that when people visit the area, they make time to eat at that restaurant. I doubt there are many people who travel far for the sole purpose of eating at that restaurant. There is a famous athlete who is well known for eating there whenever he is in the area, but I can't remember his name.
That said, I know a group of long distance motorcycle riders who gather at Pink's Hot Dogs in Los Angeles every year. They show up at 9:00 PM (some say midnight) on a Saturday night in November to see friends, swap stories, and share hot dogs. Riders come from all over, just for the hot dogs. They turn around and ride home after it breaks up around 2:00 AM or so. One year, I had a meeting in Louisville (Kentucky) that finished in the late afternoon on the Thursday before the event. I rode straight to Pinks and got there before 9:00 that Saturday evening. There wasn't enough time to stop home first. For the record, my ride was only the fourth longest ride that night. Three people had come from different parts of Florida to beat me for that year's record. Yes, just for a Pink's hot dog. It sounds crazy, but it's true, and it has been going on for a long time. If you don't believe me, search for "Bite the Wieenee Pinks" on the internet. Try different spellings of "wieenee", such as "weeenie", "weenie", etc.
The Los Angeles area is a true melting pot. There are communities here from all over the world. If you are looking for special ingredients for your food, you can find a wide range of markets that sell them. East Asia (which can be subdivided, a lot), South Asia, Middle Eastern, African, European, Central and South American - you can find markets that specialize in the foods and ingredients you need. You can find ingredients in bulk in those "ethnic" stores for a reasonable price, too.
Around me, it isn't only Vietnamese, Korean, Latino, and Mediterranean. There are many others. There is a very good meat market around the corner that specializes in Hungarian, Romanian, and other European meats. A great little hideaway store with quality meats. Lots of other examples, too.