Sprinkle 3/4 teaspoon salt and 1/4 teaspoon pepper over roast. In a large skillet, brown pork in oil on all sides. Transfer meat to a 3- or 4-qt. slow cooker.
In the same skillet, saute onion until tender. Add garlic; cook 1 minute longer. Add water, chipotle peppers and molasses, stirring to loosen browned bits from pan. Pour over pork. Cover and cook on high for 4-5 hours or until meat is tender.
Remove roast; cool slightly. Skim fat from cooking juices. Shred pork with 2 forks and return to slow cooker; heat through. In a large bowl, combine the coleslaw mix, mango, lime juice, lime zest and remaining salt and pepper. Serve pork with muffins and, if desired, lime wedges; top with slaw.
Wear disposable gloves when cutting hot peppers; the oils can burn skin. Avoid touching your face.
2/3 cup pork mixture with 1 muffin and 1/2 cup slaw: 514 calories, 23g fat (7g saturated fat), 135mg cholesterol, 877mg sodium, 46g carbohydrate (21g sugars, 3g fiber), 31g protein.