Texas Mexican Food is called Tex-Mex.
The difference between Mexican Food and Tex-Mex food is Authentic Mexican food uses pork and Tex-Mex foods tend to use beef that is readily available in Texas.
Tex-Mex food is an Americanized version of true Mexican food and can also use other ingredients such as yellow cheese, wheat flour etc that are not found in Mexican dishes.
Fajitas are an example of Tex-Mex food.
Fajitas are a Tex–Mex, Texan–Mexican American or Tejano, diminutive term for little strips of meat cut from the beef skirt, the most common cut used to make fajitas.
The word fajita is not known to have appeared in print until 1971, according to the Oxford English Dictionary.
A fajita, in Tex-Mex cuisine, is any stripped grilled meat, optionally served with stripped peppers and onions usually served on a flour or corn tortilla.
The term originally referred to skirt steak, the cut of beef first used in the dish.
Fajitas are a popular Tex-Mex dish made from grilled meat, usually beef or chicken, which is served on a sizzling hot skillet along with grilled onions and peppers.
The meat and vegetables are served with warm tortillas, guacamole, sour cream, and salsa, allowing diners to create their own unique flavor combinations.
The meat in fajitas usually mingles with grilled or sauteed peppers and onions, which are cut into similarly sized strips.
In tacos, the vegetables are often chopped or sliced and kept raw as a topping.
You can have fajita tacos.
When you're ready to eat the fajita, hold the fajita with one or two hands, using your pinkies to keep the bottom fold of the tortilla in place.
Eat your fajita normally, ending your last bite with the folded up end.
Use a fork to eat any ingredients that fall onto the plate.
Skirt steak is the traditional cut used for fajitas.
It used to be inexpensive, but now it's not so cheap; oftentimes flank steak costs less.
Either will be a good choice.