Wash the yellow lentils and split chickpeas together in a bowl. Soak for half an hour.
Pressure-cook till soft.
Mash and keep aside.
In a thick bottomed pan, heat oil.
Add all the spices listed above.
Fry till aromatic.
Add the onions. Cook till soft.
Add salt, turmeric, red chilli powder, curry leaves and mix well.
Add ginger-garlic paste and cook till the raw flavor is gone.
Now, add tomatoes and cook till the oil separates.
Now add the bottle gourd pieces and cook for 5 min.
Add the tamarind juice and bring to a boil.
Add the mashed yellow lentils and mix well.
Adjust the seasoning by adding salt.
Also, add the coriander leaves and bring to a boil. Adjust the consistency by adding more water.
Add the slit green chillies and boil.
Turn off the flame.