Place chicken, lemongrass, green onions, onion, sliced ginger, chile, peppercorns, and water in large pot. Cover; bring to boil and then simmer 1 hour.
Add cilantro and mint stems; simmer 15 minutes; strain. Reserve broth and chicken; discard remaining solids.
Shred chicken; discard bones. (Optional: Refrigerate broth and chicken separately for 4 hours or overnight; skim fat from broth.)
Combine chicken, ginger strips, cilantro leaves, sliced mint, soy sauce and mushrooms in bowl.
Divide broth among bowls; serve with chicken mixture on the side.
6 servings
1 1/2 cups
* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.