Let’s get something out of the way: Mongolian barbecue is not Mongolian. Not even a little. It was invented in Taiwan in the early 1950s, based on Chinese cooking techniques and global ingredients, and given the name almost at random. For the small but growing population of Mongolians in the United States, restaurants with names like “Mongolian Grill” have long been a point of contention. If you want to try traditional Mongolian cuisine, there’s only a handful of restaurants in the United States that serve it (a website that tracks…