Peel the parangikai / butternut squash/pumpkin and cut it in half. Scoop the fiber and seeds from the inside. Now chop the pumpkin into small pieces.
Place the chopped pumpkin in a pan and add about ¾th cup of water (or just enough to submerge the vegetable).
Bring it to a boil and let the pumpkin cook. Add salt when the pumpkin is cooked halfway through.
Now reduce the heat and add the milk to the pumpkin. Let it finish cooking in the milk. Make sure that the pumpkin does not overcook or become mushy. It should still hold its shape.
Add the rice flour slurry to the pumpkin and let it come to a boil. You will notice that the kootu is beginning to thicken now. Adjust the consistency of the kootu adding more milk if needed.
Now add the desiccated coconut and the sugar to the paal kootu. Mix well and let it simmer for 2 to 3 minutes.
Meanwhile, heat a small pan with coconut oil. Add the seasoning ingredients - mustard seeds, urad dal, curry leaves, red chili, and asafoetida.
Add this seasoning to the kootu and turn off the heat. Serve the kootu warm.