Soak shiitake in warm water for about 30 minutes to rehydrate. Drain shiitake, reserving the water in a small bowl. Take one cup of the water and mix with soy sauce, sugar, sake, and mirin in another bowl and set aside. Remove stems from shiitake mushrooms and slice thinly. Heat vegetable oil in a large skillet and stir fry together. Further, add okara and stir fry until heated through. Pour the mixture of seasonings over okara and stir fry until the moisture is almost gone. Add green onion slices and stir fry for about 1 minute.
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