In a large saucepan, heat oil over medium. Add mushrooms, scallion whites, garlic, and ginger; season with salt. Cook, stirring occasionally, until mushrooms are tender, 6 minutes.
Add broth and 3 cups water; bring to a boil. Add soba; reduce to a simmer, and cook 5 minutes. Add spinach; cook just until tender, about 1 minute. Add lime juice and soy sauce. Serve topped with scallion greens.
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