Soak yellow moong dal in a cup of water. you can wash the dal in running water before or after the soaking. after 30 minutes, drain the water.
Add the soaked yellow moong dal to a pressure cooker. add a cup of water.
Switch on the flame. While the da heating up, white scum forms on top of the dal. Using a ladle, remove the scum alone carefully without the dal.
After removing the scum, add the chopped zucchini. Add 1/4 tsp turmeric powder.
Mix well, cover the pressure cooker and pressure cook it for 3 whistles. Allow the pressure to release automatically and open the lid.
Meanwhile, grind coconut, green chillies and cumin seeds by adding 1/4 cup water.
Add the coconut paste to the cooked zucchini dal mixture. Rinse the mixie jar using 3/4 cup water and add it to the pressure cooker. Adjust the water as per the consistency you need. the kootu becomes thick once cooled down. so, keep this in mind while adding water.
Mix well and boil once. Do not boil more.
Heat coconut oil in a seasoning pan, splutter mustard seeds, urad dal, cumin seeds, asafoetida, dry red chillies, and curry leaves.
Allow the seasoning to fry and let it be aromatic.
Add this seasoning to the kootu. Mix once & serve warm with rice.