Kempwood @ Blalock
I have to thank commenter Rubiao for tipping me about this one. It's quite a ways outside of my regular roaming area but I took a little detour after a shopping trip to Super H Mart, cruising up Blalock past the best Polish grocery store and restaurant in Texas (and possibly the whole Southern US).
There are actually two units here; a short Sazon bus purveying hot dogs, hamburguesas, papas asados, papas fritas and tortas is parked at a right angle to the bigger unit. And the menu is not the same old-same old lonchera menu, either. One specialty is barbacoa de borrego available either as consomme or tacos.
I got a couple of tacos with everything, after ascertaining that meant onions and cilantro and not lettuce and tomato. Then I helped myself to the salsas on the side of the truck including a very spicy salsa fresca with marinated onions, habaneros and jalapenos, I think. That was the best of the three and really picked up the tacos which were already very good. There are not that many places offering borrego; I wish this wasn't so far away.
Also on the menu were pancitas, which I think is menudo made with sheep stomach, fajitas, cabeza de res, flautas de pollo and more.