While much of La Jolla is pretty ritzy, Don Carlos is a small hole in the wall somewhat off the main drag of the restaurants on Prospect. The food here is authentic and worth the visit. I had the chicken enchiladas and my husband had the fish tacos (fish was fried) and both extremely good. Not much ambiance, but if you need a quick bite to eat this is a great place to go. They also have vegan/vegetarian options too.