Start by dumping the coleslaw mix into a large bowl. In another small bowl, whisk together mayonnaise, sugar, rice vinegar, black pepper, and salt until smooth. Pour this over the slaw and toss until everything’s evenly coated. Refrigerate for at least 30 minutes to let the flavors develop.
In a small bowl, mix together mayonnaise, Sriracha, and chipotle pepper powder until you get a smooth, creamy sauce. Cover and chill it until you’re ready to serve. It’s simple but adds so much character to the tacos.
If you’re using rotisserie chicken, remove the meat from the bones and shred it into bite-sized pieces. Toss it with ¼ cup of barbecue sauce until well coated. This gives the chicken a smoky, sweet base that complements the pineapple perfectly.
Preheat your grill to medium heat. Lay the pineapple rings and bell pepper halves directly on the grill. Cook the pineapple for about 2–3 minutes per side, and the bell pepper for 4–5 minutes until you see those lovely char marks. Slice the grilled pepper into strips once it cools slightly.
Warm the tortillas on the grill for 20–30 seconds per side—just enough to soften and add light char. Then assemble: start with a base of coleslaw, add a layer of BBQ chicken, followed by grilled pineapple and bell pepper strips. Sprinkle with shredded cheese, a few red onion slices, and finish with a drizzle of spicy mayo and a touch of barbecue sauce.