Chop all the vegetables and set them ready. In a kadai add in a tsp of oil and add in the shallots sauté till they become soft next add in tomatoes and add till they are cooked.
Now add in the chopped vegetables and few for few mins in a low flame. Soak the tamarind in ½ cup water and add in the tamarind water and cook till the vegetables are 90 % done. Meanwhile in a pressure cooker add in the toor dal along with 1 cup of water for about 4 whistles. Wait till the pressure is completely done and then open the cooker and mash the dal well and set aside.
Now in a pan dry roast the Urad Dal, channa Dal and Fenugreek Seeds till golden brown and set aside. Next add in Coriander seeds, Dry Red Chilli, curry Leaves, Hing and Shallots till golden brown and set aside.
Next add in freshly grated Coconut and roast till golden brown and set them aside.
Add all the roasted ingredients in blender along with little water grind everything to form a fine paste. Meanwhile mash the dal add Turmeric powder and Salt and keep it ready.
Add the mashed dal, ground masala to the vegetables and mix well.
Add in the required water and mix well once it comes to a boil garnish with coriander leaves and switch off the flame.
Now prepare the seasoning with the ingredients mentioned under “To Temper” and pour over the Sambar .Serve hot with Rice.