Taste of Mexico in San Diego.
My wife and I are big fans of hole in the wall joints, and this place certainly fit that billing. We were impressed though by the great selection of tacos such as carne asada, spicy pork, tripe, lengua (tongue) and how authentic it was. It was great to see them shave the meat right in front of us, and the tacos were great. The tacos are relatively inexpensive too which was a bonus for us. If you're looking for a quick snack, or are craving "real" tacos, check this place out.