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Heat 1 tablespoon of oil in large saucepan over medium heat. Add ginger and garlic and sauté for about one minute, being careful to avoid burning.
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Add broth, raise heat, and bring to boil. Lower heat and add mushrooms and bamboo shoots, and simmer for about ten minutes.
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While your broth simmers away, heat the remaining tablespoon of oil in large skillet over medium heat. Add tofu and cook on each side until it begins to brown. Remove it from the pan and transfer to a plate.
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Once the broth has simmered for ten minutes, stir in the bok choy, vinegar, chili paste, soy sauce and sugar. Simmer an additional ten minutes. Taste test the broth and adjust the seasonings to your liking.
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Add tofu and cornstarch mixture into the broth, stir well, and remove from heat.
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Stir in the scallions and cilantro, setting just a bit of each aside.
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Ladle the soup into bowls and top with remaining scallions and cilantro, and optionally, a few sesame seeds.