Place steak and bbq sauce into glass baking dish, cover with plastic wrap, and refrigerate for 12-24 hours. Flip steak occasionally.
Preheat the grill to medium-high heat. Remove steak from refrigerator and let stand at room temperature for 45 minutes before grilling.
Grill steak until they reach medium rare doneness (135ºF). Remove from grill and let rest for 10-15 minutes.
Thinly slice the steak across grain.
Prepare slaw but adding cabbage, carrots, cilantro, bell pepper, and red onion. Toss in Asian dressing.
Using a 9"x13" dish, pour ¼ cup enchilada sauce evenly along the bottom of the dish.
Heat tortillas on grill, then place on platter. Top tortillas with steak and slaw mix. Drizzle with sriracha mayo and squeeze a lime wedge over each taco and enjoy!