Vegan Hot and Sour Soup with Tofu

Name: Vegan Hot and Sour Soup with Tofu
Ingredients: 10 dried lily buds; 5 dried wood ear mushrooms; 2 tablespoons vegetable oil; 2 cloves garlic, minced; 2 stalks scallions, minced, plus more for garnish; 1 tablespoon minced ginger; 1 quart vegetable broth; 1 pound firm tofu, diced; 1/2 cup bamboo shoots, thinly sliced; 1/4 cup Chinese black vinegar, plus more to taste; 2 tablespoons soy sauce, plus more to taste; 1 tablespoon toasted sesame oil; Fresh ground black pepper; 1 teaspoon sugar; 1 tablespoon cornstarch; Chili oil, for serving