In a pressure cooker, add the washed lentils, green chillies, turmeric, some salt and a pinch of oil, with sufficient water - a cup should do.
Pressure cook for one whistle and keep on low flame for five minutes. Switch off and allow the pressure to go on its own.
In an earthern pot, heat the coconut oil. Splutter mustard seeds. Briefly fry the cumin and fenugreek seeds.
Fry the curry leaves, dried red chillies and garlic for a couple of minutes.
Add the onion and saute till browned.
Now add the cooked dal along with a little more water, if too thick. Mix it in and simmer for the flavors to mingle.
Add the coconut milk, adjust salt and just simmer for a minute - do not boil or else the curry will split. Switch off and leave it closed for a few minutes.
Serve warm with side of choice.