Preheat oven to 350°F.
In a small bowl, add soy sauce, plum sauce, tomato paste, hoisin sauce, dry sherry, ginger, garlic, sesame oil and salt. Whisk together to mix well. Set aside.
Rub sugar on all sides of ribs.
Place ribs on greased or sprayed rack, in foil lined roasting pan, meat side up.
Place in preheated oven. Bake, tightly covered, 1 1/4 hours.
Remove from oven. Remove ribs to a plate.
Drain juices from pan.
Remove rack.
Place ribs back in pan.
Spread sauce over ribs, turning to coat.
Place back in oven. Bake, uncovered, 40 minutes or until ribs are tender and glazed, turning and basting twice.
Cut into appetizer single-rib servings if desired, or use as a main course.