I see you’ve been to Tacos Nayarit in Durango. Also, real tacos have cabbage not lettuce on them.
Actually, I just grabbed all those images off the web, so it wasn’t me that went there :)
Never had tacos with cabbage. Around here, the tacos come with onions and cilantro only, with queso and crema by request. If you order it with lettuce and tomato, it’s called a “gringo taco”.
I grew up in Durango and I don’t recall a single fast food Mexican place, but this was in the ‘70’s and early ‘80’s. I do remember that we would always go to Francisco’s down by the train station for special family occasions.