Step 1
In a small bowl, mix the vinegar and cornstarch until smooth. In a saucepan, combine the chicken broth, water, bamboo shoots, shiitake mushrooms, garlic, ginger, soy sauce, and red pepper flakes. Bring everything to a boil over medium-high heat, then lower the heat, cover, and let it simmer for about 5 minutes. Take the lid off and gently add the tofu. Turn the heat back up so the soup comes to a boil again, then slowly pour in the beaten egg while stirring to create ribbons. Pour in the cornstarch mixture and keep the soup simmering over medium heat until the broth thickens just a bit, around 3 minutes. Finish by sprinkling chopped green onions on top before serving.



