Vegetarian Hot and Sour Soup (素酸辣汤)

Name: Vegetarian Hot and Sour Soup (素酸辣汤)
Prep time: 15 min
Cook time: 10 min
Total time: 25 min
Cuisine: Chinese
Ingredients: 5 to 8 (about 1 tablespoon) dried wood ear mushrooms ((*Footnote 2) (Optional)); 1/3 cup shiitake mushrooms (, dried); 1 cup dried lily flowers (, dried); 2 tablespoons Chinkiang vinegar; 1 teaspoon white pepper powder; 6 cups vegetable stock ((*Footnote 2)); 1/2 block (8 oz / 226 g) firm tofu (, cut to 1-cm (1/2-inch) cubes); 1 can (5 oz / 141 g) bamboo shoots ((about 1 cup)); 1 tablespoon ginger (, minced); 1 tablespoon light soy sauce ((or soy sauce)); 1/2 tablespoon dark soy sauce ((or soy sauce) (*Footnote 3)); 1/2 teaspoon salt; 2 cups Napa cabbage (, chopped); 3 tablespoons cornstarch; 1 egg (, beaten (*Footnote 4) (Optional)); 2 teaspoons sesame oil (, toasted); 1/2 cup cilantro (, chopped)