Place spareribs in shallow glass or plastic dish.
Mix beef broth, soy sauce, honey, vinegar, sherry, sugar, salt, ginger root and garlic; pour over ribs.
Cover and refrigerate, turning ribs 2 or 3 times, at least 6 hours.
Remove ribs from marinade; reserve marinade.
Arrange ribs meaty sides up in single layer on rack in foil-lined broiler pan.
Cover and cook in 350° oven 45 minutes.
Brush ribs with marinade.
Cook uncovered, brushing occasionally with marinade, until tender, about 50 minutes.
Garnish with green onion tassels.