Calbi Food Truck services the LA and Orange County area and they serve Korean style tacos and burritos.
I really like the fact that they keep their menu simple and each item is good. Here are some pictures of their Spicy Pork and their Korean Short Rib tacos:
Now to be honest I haven’t eaten at tons of food trucks yet (although that will change soon), but from the few that I have tried I would definitely recommend trying Calbi food truck. Their tacos were super good, the day I was at a food truck festival I ended up going back to them for seconds.