fajitas aren't Mexican food, it's just tex with no mex
semp
It was invented by the Mexicans who worked the ranches where I was born and raised in the Rio Grande Valley. So they are an authentic Tex-Mex creation in every sense of the term. It was born out of necessity to make use of what was not considered the best cut of meat around.
We are not poor ranchers and ranch hands working cattle any more. We can use better/different meat than skirt to make a far superior version of the same "dish" and there's not a thing wrong with doing so. If you want to make yours with skirt go for it. I make mine with whatever I want to use that day based on what I see on the shelf. The butchers here in Texas (particularly at H-E-B) make plenty of cuts that are fine for use in fajitas. Take your pick.
People thinking sirloin isn't tender enough sure don't have much room to comment on fajitas.
