In a separator add pumpkin, salt and buttermilk; mix well
Close the separator with a lid and pressure cook for 2 whistle. Let the pressure releases naturally
In a mixie jar add coconut, green chili and little water and grind
After pressure realised naturally add oil to a pan
When oil is hot add mustard seed and let them splutter
Add urad dal and cook the dal turns golden brown
Finally add curry leaves and saute. Transfer them to a small bowl and turn off the stove
Add cooked white pumpkin along with water, ground coconut and mix well
Turn on the stove and cook for 2-3 minutes
Check the salt and add if required
Mix the kootu once in a while
Cook till the kootu comes together and boils well
Lower the flame and add curd
Mix well and switch off
Add tempering and mix well. Poosanikai more kootu is ready