Not my intention to offend anyone, but I've always chuckled at the question of "what type of meat for fajitas?"... I grew up in South Texas, Zapata, TX to be exact and where I grew up fajitas is a particular cut of meat! the diaphragm, typically thought of as a lesser cut in the old days. I see "fajitas" now used as a general term for pretty much any meat that is grilled and then sliced into strips. When I grew up, at least back home we didn't have "chicken fajitas" or God forbid "shrimp fajitas", I still laugh at that. Anyway to me fajitas is a specific cut, the diaphragm, traditionally we "butterfly" them, making it pretty thin, where you can grill them fast over a hot fire. To me marinades vary, but I've seen soy with beer and garlic the fajita seasoning, soy with orange juice, some use Goya's Naranja Agria (bitter orange), I've seen marinades that use Apple Cider. Some people just use dry seasonings and some limas (limes or the key limes<<<tastier in my opinion). Incidentally, if you have ever heard of "tacos al carbon" this is simply diced fajitas topped with onion and cilantro and in a corn tortilla (has to be corn) that has been softened with a dab of oil on a cast iron skillet, and then a red salsa and a green tomatillo salsa. Anyway, I had to chuckle a bit at this thread, but I'm a born and raised south texas boy now displaced to the east coast, where I am shocked what is called a fajita up here, I grew up in a family where my grandma used to by Fry-Rite in a 5 gallon bucket and made the best damn flour tortillas, so I also am constantly shocked at what pass for tortillas!