Pressure cook ⅓ cup moong dal with 1 cup water in medium flame for 4 whistles.
Meanwhile, eliminate the root part of the spring onion. Wash it thoroughly.
Chop finely both the white part and green part.
Add ¾ cup water, salt, ¼ teaspoon turmeric, 1 teaspoon sambar powder and ¼ teaspoon sugar.
Cook for 3-4 mins. spring onion gets cooked very soon.
While it is cooked, grind ½ cup grated coconut with ½ teaspoon cumin seeds, little water to a paste.
Add cooked dal, ground coconut paste and mix well.
Bring to boil and switch off the flame.
Heat a kadai/ pan and add oil. Splutter ½ teaspoon mustard, 1 teaspoon urad dal and add curry leaves if adding.
Mix this to kootu and serve.