Asian chili sauce (such as Sriracha), for serving (optional)
fresh lime juice, plus lime wedges for serving
1/4 cup fresh mint leaves
2 boneless, skinless chicken breast halves (6 to 8 ounces each), thinly sliced crosswise
1 fresh lemongrass (3 inches), smashed, or 3 sticks dried lemongrass
8 oz. rice noodles
8 oz. snow peas, trimmed and halved
1 peeled fresh ginger (1 inch), cut into matchsticks
2 cans (14.5 ounces each) reduced-sodium chicken broth
Coarse salt and ground pepper