Heat chicken broth to boiling. Add pork strips, bamboo shoots, Wood ear (drained), bean curd, and mushrooms. Return to boiling and add salt, soy sauce, sugar, white pepper, red pepper sauce, and vinegar, stirring all along. Continue boiling for a total cooking time of 20 mins. Stir in cornstarch mixture and keep stirring until soup is thickened. Pour beaten eggs gently over the top. Turn off the heat and stir eggs gently into soup. Add sesame oil. Spoon into bowls and serve topped with chopped green onions if desired.