Heat 2tsp oil in a pan, add chana dal, urad dal, mustard, cumin seeds, dry red chili and curry leaves. Once the seeds start to splutter, add sorakaya/ bottle gourd and green chilies.
Cover and cook till sorakaya/ bottle gourd is tender, about 6~8 minutes.
Whisk rice flour into milk along with sugar in a small bowl.
Once the bottle gourd is cooked through, add the milk mixture along with salt. Cook till the mixture thickens. Serve hot with steamed rice.