Rinse the coriander leaves, mint leaves (if using), and green chilies thoroughly. Drain well.
Peel and chop the raw mango into small pieces.
Peel the ginger and cut it into small pieces.
In a blender or food processor, add fresh coriander leaves/cilantro, fresh mint leaves, chopped ginger, and green chilies.
Add chopped raw mango, black salt (kala namak), asafoetida (hing), black pepper powder, cumin seeds (jeera), water (as needed) to the blender.
Now grind all the ingredients until you reach your desired consistency. The chutney should be smooth and thick, not too runny.
Taste the chutney and adjust the seasoning if needed. You can add more salt, or green chilies to suit your taste.
Transfer the chutney to a bowl and serve immediately. Green Mango Chutney pairs well with Indian snacks like samosas, and pakoras, or as a spread in sandwiches and wraps.
Store any leftover mango coriander chutney in an airtight container in the refrigerator. It will stay fresh for 3-4 days.