Place ribs meaty side down in a shallow roasting pan. Roast, uncovered, in a 450 degrees F oven for 30 minutes. Remove from oven; carefully drain fat from ribs.
Turn ribs meaty side up. Reduce oven temperature to 350 degrees F; continue roasting ribs, uncovered, for 1 hour. Carefully drain off fat. In a medium bowl combine the marmalade, water, soy sauce, garlic or garlic powder, ginger, and pepper; stir thoroughly. Pour over the ribs.
Roast ribs, uncovered, for 30 minutes more or until tender, spooning sauce over ribs occasionally. If desired, serve with orange wedges and garnish with green onion brushes. Makes 4 servings.