In a bowl, soak the kokum in 1 cup of hot water. Let it sit for 30 minutes to 1 hour to extract the flavor.
After soaking, squeeze the kokum well and strain the water. Discard the kokum.
Add 2 cups of regular water to the strained kokum extract. Keep this kokum water aside.
Heat oil in a pan. Add cumin seeds and let them splutter. Add asafoetida, curry leaves, and chopped green chillies. Sauté on low heat for about a minute until aromatic.
Pour in the prepared kokum water.
Add salt and jaggery. Stir well.
Bring it to a gentle boil and let it simmer for 2–3 minutes.
Turn off the heat and garnish with chopped coriander leaves.
Serve hot as a light, tangy soup or with steamed rice.