Amigos: I'll be doing "research" (edible) in LA in a couple of weeks and I'm looking for recommendations for muy authentico soft tacos. I'm not squeamish (all fillings welcome) and I'm not nervous (any location is fine). It doesn't have to be a restaurant or even a hole in the wall. Trucks are fine, too, as long as you can give an approximate location. Soooo...Where do you go for the ultimate taco?