Both ripe and underripe mango work well in this chicken and vegetable stir-fry. If the mangoes you have are less ripe, use 2 teaspoons brown sugar. If they're ripe and sweet, just use 1 teaspoon or omit the brown sugar altogether.
- Combine fish sauce, lime juice, cornstarch and brown sugar to taste in a small bowl.
- Heat 2 teaspoons oil in a wok or large skillet over high heat. Add chicken; cook, stirring, until just cooked through, 5 to 7 minutes. Transfer to a plate.
- Add the remaining 2 teaspoons oil, garlic, ginger and chiles (or crushed red pepper) to the pan. Cook, stirring, until fragrant, about 15 seconds. Add broccoli and water; cook, stirring, until beginning to soften, about 2 minutes. Add mangoes and scallions; cook, stirring, for 1 minute. Add the reserved sauce and chicken; cook, stirring, until the sauce is thickened and the chicken is heated through, about 1 minute. Stir in cilantro, basil and mint. Serve with lime wedges, if desired.