North 6th Street, On the Right
Just past Buttonwood
Reading PA

Doesn't get much more authentic than this.  Might well be driving through some small town in Mexico.

Tried a couple of tacos, complete with lime and radishes.  One pork taco, one steak.  They also have cow tongue.  In season be sure to try elotes exquisitos - a Mexican speciality - corn coated with mayonnaise and rolled in grated cheese.