1. In a bowl, toss coleslaw mix with mayo and apple cider vinegar. Chill until serving.
2. Grill the sliders over medium heat for 2-3 minutes per side. Top each with cheddar cheese during the final minute.
3. Lightly toast all 12 buns.
4. To assemble: spread BBQ sauce on each bottom bun, then add slider patty, 2 pickle slices, a spoonful of coleslaw, and a heap of fried onion strings. Top with bun.
5. Serve warm for the ultimate bite-sized BBQ experience!