PLACE meat in disposable foil pan. Mix barbecue sauce, pineapple juice, garlic and ginger. Pour one-third of the barbecue sauce mixture over meat; cover and refrigerate 20 min. to marinate. Refrigerate remaining barbecue sauce mixture until ready to use. Meanwhile, preheat barbecue to medium heat.

PLACE meat (in foil pan) on grate of barbecue; cover with lid. Grill 3 to 3-1/2 hours or until meat is cooked through (160ºF). Remove meat from barbecue; cover with foil. Let stand 10 min. Meanwhile, pour remaining barbecue sauce mixture into large saucepan; cook on medium-low heat until heated through, stirring occasionally.

SHRED meat with two forks or chop into bite-size pieces. Add to saucepan; toss to coat. Serve in buns.