Grind coconut, green chilli and cumin seeds to a coarse paste without adding water.

splutter mustard seeds

Put in some curry leaves

Then goes in washed and finely chopped beans

Add salt

Add very little water and close and cook in simmer until beans are done.

Open and add the coconut - green chilli -cumin paste. Mix well and let it cook until well combined and all water gets evaporated.