Wash,peel and chop raw mango in small pieces.
Take mustard seeds and rai kuria in a mixer jar and grind for few seconds .
Now add salt, turmeric, green chilies, raw mango and mustard oil.
Grind to make a slight coarse paste.
Pour the mixture in a glass jar or earthen pot , Don't use plastic jar.
Add 3 tsp of mustard oil over the prepared kasundi
Cover the jar with a fine muslin cloth.
Keep the jar for 4-5 days in sunlight.
Keep refrigerated after 5 days
Serving suggestions-Serve with any fried snack,as a side dish or use as a marinade.