In a blender combine curd, mint leaves, coriander leaves, cumin powder, ginger, black salt, salt and blend well. Add 2 Cups water and give it a quick blend again.

Now heat oil, add cumin seeds and green chili paste, sauté for few seconds and add to chaas, mix well. Transfer this chaas to a large bowl.

Heat the coal, put in a smaller bowl and gently place inside the large bowl, taking care to not let the chaas get into it.

To the small bowl, add curry leaves and clove. Now carefully pour oil over hot coal and cover with aluminium foil. Let sit for 5 mins then remove and serve in glasses.

Serve chilled.