1. Take a pan, put 3 tsp oil in it.
2. Add mustard, curry leaves, chopped onion, green chilies. Fry for sometime.
3. Mix all the ingredients to butter milk and add this to onions and let it cook for 1/2 hour.

Note:

• You can add any vegetables like raw banana, carrot, yellow cucumber, chow chow, drumstick or pakodis also.
• Tastes good for the next day.