Steak fajitas are a Tex-Mex favorite that are made by marinating thinly sliced cube steak in a mixture of lime juice, garlic, and spices. The steak is then cooked with sliced onions and bell peppers until tender and flavorful. The fajitas are typically served with warm tortillas, guacamole, sour cream, and salsa. This dish is perfect for a quick and easy weeknight dinner.