1. Bring chicken broth to a boil in large saucepan over high heat; add pork, mushrooms and tofu, if desired. Reduce heat to medium-low; simmer, covered, 5 minutes. Stir in vinegar, sherry, soy sauce and pepper.

2. Return broth mixture to a boil over high heat; stir in ramen noodles (look at the end of the Ramen and you wills see you can split the noodle brick in half). Cook, stirring occasionally, 5 to 7 minutes or until noodles are tender. Slowly stir in beaten egg and green onions; remove from heat. Ladle soup into individual bowls.