Soak 1/2 cup (125 ml) lentils or yellow moong dal in water for atleast 15 mins prior to pressure cooking.
Wash, peel and roughly chop Noolkol into thick chunks (easier to pressure cook and will not turn mushy)
Now pressure cook the noolkol and the lentils with enough water along with turmeric powder.
For the coconut gravy, heat a small pan or kadhai, add coconut oil along with Urad dal, Whole red chillies, Jeera and cumin seeds.
Saute this until the urad dal turns brown. To this, add grated coconut and saute for a few seconds.
Remove the pan from heat and allow it to cool completely before grinding with 3/4th cup of water into a thick gravy.
Once the vegetable and lentils have cooked, heat a kadhai, add 2 tsps of Coconut oil, whole red chillies, mustard seeds and curry leaves along with a pinch of asafoetida or hing.
Once the mustard crackles, add the cooked lentils + Noolkol and the coconut gravy. Add salt to taste and mix everything together.
The Kootu will be very thick so add some water to adjust consistency. Check for salt and add extra, if required.
Simmer for a few seconds only and then switch off the flame, serve it piping hot with rice or chapati.