Soak tamarind in warm water for 20 minutes and take the extract. Set aside.
Peel the onions and chop the tomatoes.
Pressure cook the dals with turmeric powder, pumpkin pieces and a drop of oil.
Mash and set aside. Cook drumstick and other vegetables separately and set aside.
In a pan, roast all the ingredients mentioned in the roast and grind section and make it a powder.
In the same pan, add oil and temper all the items in the same order.
Now add the sambar onions and saute till transparent.
Add the tomatoes (crush it with your hands before adding) and required salt.
Sauté till tomatoes turn mushy and juicy. Add the tamarind extract, raw pinched curry leaves, hing, sambar powder and turmeric powder.
Allow to boil till the onions get cooked.
Add the mashed dal, cooked vegetables and the ground powder. Mix well so that there are no lumps.
Boil for few minutes. It will thicken. Add more water if necessary.
Switch off the flame add garnish with coriander leaves.
Add a tablespoon of ghee & cover it with a lid until you serve.