In a small bowl, combine broth, hoisin sauce, rice wine or sherry, ketchup & hot sauce. Set aside. Place a wok over high heat, when hot, add vegetable oil. Add garlic & stir for 5 seconds. Add tofu & stir fry for 2 minutes. Stir in reserved sauce & cook 1 minute. Add bean sprouts & cook another minute. Add dissolved cornstarch & stir till sauce thickens. Serve over noodles tossed in sesame oil or over steamed rice.. Garnish with onions.