The best food I've had in Mexico is the street food. Where can we go in LA? I have some thoughts and would like yours:
8th Street, south side near Guelaguetza: Tamales.
Downtown near produce market (say 10th and Main or so): I've had good breakfast burritos early on a weekend morning.
York Blvd around 46th Avenue: Seem to be a number of taco stands late at night. And at least one bar/nightclub that could be just across the border in an entertainment zone (I'm not going in there again. I don't know the rules).
Alameda Swap Meet.