5 dried shiitake mushrooms (about 1/4 ounce)
5 dried wood ear mushrooms (about 1/4 ounce)
1 (32-ounce) carton fat-free, less-sodium vegetable broth
2 1/4 cups water, divided
1 tablespoon minced peeled fresh ginger
1 teaspoon minced garlic
1/4 cup rice vinegar
1 tablespoon low-sodium soy sauce
1/2 to 1 teaspoon freshly ground black pepper
1/2 pound reduced-fat firm or extrafirm tofu, drained and cut into 1/4-inch cubes
2 1/2 tablespoons cornstarch
4 large egg whites, lightly beaten
1/2 cup chopped green onions
1/4 cup minced fresh cilantro
1 teaspoon dark sesame oil
Chili oil (optional)
Place mushrooms in a medium bowl; cover with boiling water. Cover and let stand 10 minutes or until tender; drain. Thinly slice mushrooms; set aside.
Combine broth, 2 cups water, ginger, and garlic in a large saucepan over medium-high heat; bring to a boil. Add mushrooms. Reduce heat, and simmer 5 minutes. Add vinegar, soy sauce, pepper, and tofu; bring to a boil. Reduce heat, and simmer 5 minutes.
Combine remaining 1/4 cup water and cornstarch, stirring with a whisk. Stir cornstarch mixture into broth mixture; bring to a boil. Reduce heat; simmer 3 minutes or until soup thickens slightly, stirring frequently. Slowly pour egg whites into broth mixture in a steady stream, stirring constantly but gently with a wooden spoon. Remove from heat; stir in onions, cilantro, and sesame oil. Drizzle with chili oil, if desired.
--Adapted from Cooking Light magazine