I put 'Korean' in quotes because I don't know how authentic this recipe is. Everything Korean is extremely popular in Thailand, as it has been for a few years, so I suspect a lot of things get 'labeled' Korean even if they're adaptations of Thai foods or whatever. Curiously, I got this recipe from a Thai cookbook that came with my new microwave oven (it was a Korean brand, I should note). It had the beef cooked by microwave, which didn't seem to be the best idea, so I just fried it up in a skillet. If you have a grill, it's probably even better.