Alex Stupak, on what it means to be “authentic” cuisine:
Birthright or no, whether you’re in Baja or Brooklyn, the fact of the matter is that there really is no such thing as a singular Mexican cuisine. It’s as broad and unspecific a category as Italian or American Cuisine. Mexican cooking is regional and borderline clannish. You will never get two people from L.A. to agree on where to find the best fish taco. In much the same way, if you are shopping for ingredients indigenous to Oaxaca in a Pueblan market, do not be surprised if someone tells you that they simply do not exist.
Good summation here.
If one were to seek a prime example of cuisine bastardization, they needn’t look farther than what Taco Bell does to Mexican. (Though I admit that some of their breakfast items are tasty, if not authentic or healthy.)