Well San Antonio is the TexMex capital of Texas. El Paso is really South Western style Mexican food. Tamales are not really breakfast food they are however a Christmas tradition all over South Texas. Pork is the star ingredient and thin masa wraped never the thick masa of interior Mexico or the Yucatan. I have had some killer iguana tamales in the Yucatan that you would swear are dark meat chicken. Real Mexican food with mole and the like is found closer to the borders Laredo has real Mexican food as does Eagle pass. Breakfast tacos which was the original post are solidly TexMex especially anything with a flour tortilla in Mexico you will be shunned to even ask for flour everything is on corn.
Nothing better than a properly made tamale. Over the years I’ve been invited to tamale processing “parties” around Christmas time. Mostly to do scud work but the trade-off nice supply of tamales.