Wash and peel the skin of Bottle gourd. Remove the centre spongy part. Discard it. Chop roughly into cubes. Wash and chop onion, garlic, ginger, tomato.
In a pressure cooker, heat oil. Splutter mustard seeds, crushed dhania seeds, cumin seeds. Saute onion, garlic cloves, ginger pieces. Add tomato and saute till mushy.
Add bottle gourd cubes, sambar powder, turmeric powder, salt and water. Pressure cook in low flame for one whistle. Open the lid after the steam is released. Drain the excess water and set aside. Mash everything well till it becomes a coarse paste.
Add the reserved water and boil for few minutes till its thick. Switch off the flame and garnish with coriander leaves.
Heat coconut oil in a small kadai. Temper mustard seeds, urad dal, chana dal, red chilli, curry leaves and hing. Add to the kadayal. Mix well and serve with rice adding ghee. Enjoy !
Notes
Adjust the quantity of sambar powder as per your taste.
Here I have tempered twice. You can skip adding mustard seeds and use curshed dhania and cumin seeds in the first step.