Prepare the meat and set up the grill for:
While the grill heats up, heat in a large skillet over medium-high heat:
Add and cook, stirring, until tender and browned, about 7 minutes:
Toss with:
Remove from the heat and cover to keep warm. Grill the meat as directed. While the meat rests, warm on the grill:
Slice the steak across the grain into thin strips. Serve with the tortillas and:
To assemble, place some steak and sautéed onions and peppers on each tortilla, and top as desired.