Heat half of grill to high heat. Other side to medium. Wrap tortillas in foil and place on warm side of grill to warm through. Turn now and then. Oil grill with vegetable oil-saturated paper towel using tongs so steak won't stick. Toss steak onto hot side of grill keeping in a shallow close pile. Add salt and pepper to taste. Squeeze juice of limes over steak. Toss frequently with tongs. Sear steak on outside to a nice deep brown leaving inside medium rare. This only takes about 1-3 minutes depending on how hot your grill is. Serve on warmed tortillas with toppings of choice. If wanting peppers and onions, toss them on the grill, too, with the steak. *No extra spices to mask the simple goodness of the steak. Incredibly delicious!!
*Tortillas can also be grilled if preferred. **All grills differ, so just make sure you cut your steak pieces just large enough so that they don't fall through the grates, or use a mesh grill pan.