I still haven't found any better Carne Asado tacos than in Sonoyta at El Serape (on the west side of the T intersection)- and that includes visiting taco stands in Tucson (El Guerro Canelo, BK, etc.), Phoenix, and Penasco. They're only open after 4:00 pm, but if you go around 7 or 8, the number or locals and truck drivers who are there will confirm this is the place to go. One night at the border, we saw one of El Serape's workers with bags of food going into the Immigration office in Lukeville. We asked him if he was going to the US, and he said no, just delivering tacos etc. He said they request their food all the time. We also have seen contractors from Ajo make a taco run. Russ, if you and Naomi are up for it, maybe we can do a taste comparison in Penasco!