Hot and Sour Soup

Chinese night
Ingredients
5 fresh wood ear mushrooms--I didn't use wood ear, I used oyster mushrooms. You could also use white mushrooms.
4 fresh shiitake mushrooms
4 cups chicken stock
1/3 cup diced bamboo shoots
1/3 cup lean ground pork
1 teaspoon soy sauce
1/2 teaspoon white sugar
1 teaspoon salt
1/2 teaspoon ground white pepper
2 tablespoons red wine vinegar
2 tablespoons cornstarch
3 tablespoons water
1/2 (16 ounce) package firm tofu, cubed
1 egg, lightly beaten
1 teaspoon sesame oil
2 tablespoons thinly sliced green onion
Directions
After trimming off any tough stems, slice the mushrooms. Place the mushrooms, stock, bamboo shoots, and shredded pork into a saucepan. Bring to a boil, and simmer for 10 minutes.
Stir in soy sauce, sugar, salt, white pepper, and vinegar. Combine cornstarch with 3 tablespoons water. Add a little of the hot soup to the cornstarch, and then return all to the pan. Heat to boiling, stirring. Add the bean curd, and cook 1 to 2 minutes.
Just before serving, turn off the heat. Stir the egg in gradually. Mix in sesame oil. Sprinkle each serving with scallions.