I've heard of Pepe's--just never tried it. I tried it, now I'm stuck on them! The best soft tacos around, add guacamole--and I'm done. Not greasy--good stuff. Priced a little higher than other mom and pop places I've tried in the Pasadena area--but worth it. Good size portions. Horchatas very tasty. Drive thru too--can't complain.
Pros: Tasty, authentic, not greasy
Cons: Going South on Rosemead--you can miss the entrance if you're speeding!