Clean the drumsticks and cut into small pieces.
Put the dal along with turmeric, green chillies and salt, add 2 cups of water and bring it to a boil.
Cook on low flame till the dal is almost done. Add in the drumsticks and more water if needed and cook till done.
Meanwhile, grind the ingredients under "for grinding" with little water till smooth.
Add it to the cooked dal and cook on simmer for five minutes. Switch off.
Heat oil for tempering. Splutter the mustard seeds. Fry the curry leaves and dried chilies briefly. Pour into curry and keep closed for five minutes.
Serve hot with rice and fish fry.