As a first step, cook the pigeon pea lentils (toor dal) with a cup of water and turmeric powder. Along with this cook the veggies like beans, potato and carrot. Use pressure cooker for faster cooking.
In a vessel, cook sweet pumpkin and green peas with some water. This cooks faster directly on stove top itself (It may get dissolved in pressure cooker).
Now, while veggies are cooking, roast and grind the spices along with coconut. They are mentioned under "Roast and Grind ingredient list above"
Combine the veggies from pressure cooker with that of vessel. Add the masala prepared in above step.
Add tamarind juice, jaggery and salt. Adjust water and bring it to good boil.
Heat a small wok and all the tempering ingredients. Let the mustard seeds splutter, pour it over kootu.