(Warning: I LOVE authentic Mexican and am MEH for tex-mex. Many of the places that keep me coming back are holes in the wall that could scare others off. But that is where you get the best food.)
Go to
La Altena on Main/Broad. If you want any other Mexican after that, we'll revisit. lol
Hixson:
Las Morelianas
Taco Town
Hamilton Place area:
Taco Roc (Tho it's been up and down over the past decade with ownership changes. It was really good a month ago.)
Hwy 58:
Don Betos Tacos y Tortas
Soddy Daisy/Hixson:
El Metate (Though it's dangerously close to the standard tex mex type cuisine.)
I75/153 split:
Molcajete Mexican (It's more tex-mex, but it's good. I would go there or Metate before Mayan Kitchen for that sort of cuisine.)
Mayan Kitchen? Meh... If you've had decent corporate "Mexican" food elsewhere, you've had it before.
If you're in the Chattanooga area, I'll meet you for lunch at any of the above, about any time. Let's start at La Altena.