Make the BBQ Sauce: Blend chipotle peppers, adobo sauce, ketchup, vinegar, garlic, mustard, paprika, cumin, and black pepper in a food processor until smooth. Set aside.
Prepare the Jackfruit: Shred the jackfruit pieces by hand, discarding any hard core pieces. In a skillet, sauté sliced onion in olive oil until soft. Add shredded jackfruit and cook for 5 minutes. Add water and half of the BBQ sauce, simmer covered for 20 minutes..
Make the Quick Slaw: Combine shredded cabbage, cilantro, lime juice, olive oil, salt, and pepper in a bowl.
Assemble the Sandwiches: Serve pulled jackfruit on buns with remaining BBQ sauce, quick slaw, and desired fixings.