Rub salt and pepper over roast. Transfer to a 5- or 6-qt. slow cooker. In a small bowl, mix the mango nectar, pineapple, chutney, lemon juice and zest. Add to slow cooker. Cook, covered, on low until meat is tender, 6-8 hours. Cool slightly.
Remove roast from slow cooker. When cool enough to handle, shred meat with two forks. Strain cooking juices, discarding fruit; skim fat. Return cooking juices and meat to slow cooker. Stir in green onion. Serve on buns. If desired, top with jalapeno.
Test Kitchen tips
Top with chopped cilantro prior to serving.
Pair leftover meat with crisp bread, pickle and mustard for an easy Cuban sandwich.