PREHEAT oven to 325°F. Mix preserves, mustard, pineapple juice, soy sauce and ginger until well blended; set aside. Place roast, rib side down, in shallow roasting pan. Insert meat thermometer into roast without touching the bone.
BAKE 1-1/2 to 2 hours or until meat thermometer registers 155°F, brushing with the mustard mixture during the last 20 min. of the baking time.
COVER roast with foil; let stand 10 min. before carving roast to serve. (Meat temperature will rise about 5°F during the standing time.) Garnish with orange wedges, if desired.