Pat ribs dry. Combine the molasses, garlic salt, onion powder and Worcestershire sauce; brush over meat. Place ribs on a rack in a small shallow roasting pan. Cover and bake at 300° for 1 hour or until tender.
In a small saucepan, combine the soy sauce, pineapple juice concentrate, vinegar, hoisin sauce, ketchup, lemon juice, mustard, Worcestershire sauce, ginger and garlic. Bring to a boil. Reduce heat; simmer, uncovered, for 10 minutes or until slightly thickened, stirring occasionally.
Coat grill rack with cooking spray before starting the grill. Brush ribs with some of the glaze; grill over medium heat for 8-12 minutes or until browned, turning frequently and brushing with additional glaze. Serve remaining glaze on the side. Garnish with onion.