Heat 2 tsp of oil and saute onions, when onion turns transparent, add tomatoes and cook until tomatoes become mushy. Keep it aside.
Cut all the vegetables into slightly big pieces and keep it ready.
Soak tamarind in 1 cup of hot water for 15 minutes. Extract its juice and discard the pulp.
Take a pressure pan/cooker, add all the vegetables, 1/2 cup of water, turmeric powder, salt needed and pressure cook for 1-2 whistles. You can also cook in a pan but will take a longer time.
Then add the ground paste, cooked dal, cooked onion-tomato mix and cook on low flame for 15 minutes until everything gets blended well.
Heat a tsp of oil, add mustard seeds, when it splutters, add urad dal, hing, curry leaves and pour it over the kootu.
Check out more Kootu Varieties