This stage checks for the salt and sourness, if less salt adjusts it and it is sourer add some more water. Let it boil in low flame.
We should not boil the rasam after adding the tamarind extract so once it started to foams at the top switch off the stove.
Add coriander leaves & mint leaves serve hot.
Notes
Don't boil the rasam for long after adding the tamarind extract that is why we are cooking the drumstick in water before adding the tamarind extract. Once it started to foams at the top immediately switch off the stove and add coriander leaves. Addition of mint leaves added flavor to the rasam don't skip.
Recipe by Prema's Culinary at https://premasculinary.com/2021/05/murungakkai-rasam-drumstick-soup.html