Pressure cook the Toor Dal with enough water for 4-5 whistles until it becomes mushy. Smash it again with a ladle and set aside.
In a kadai, add a spoon of ghee and dry roast the ingredients under `to roast and grind` one by one and finally add a small piece of coconut to it. Grind it to a semi fine powder and set aside.
Again, add oil in a kadai and add mustard seeds and cumin seeds for tempering.
Then add the chopped onion, tomatoes and sauté for about 2 minutes till tomato shrinks and raw smell leaves.
Add water at this stage and add turmeric powder, sambar powder and salt and allow it to boil for some time. (Use sambar powder a small quantity, as we have pepper and red chillies in the grinded paste)
Then transfer this to the cooked dal and allow it to boil for 5 more minutes.
Soak tamarind in warm water, discard the seeds and add this to sambar,
Once the raw tamarind smell is set aside, add the grinded powder. Mix it well without any crumbs. Allow it to boil for 2 minutes
Then add 1 or 2 spoons of grated jaggery. Allow the sambar to boil and thicken. Once it is boiled and reaches the desired consistency, add coriander leaves.
This Idli Sambar Hotel Style / Tiffin Sambar is perfect with idlis and dosas. Serve hot with idlis drizzled with ghee!!
You can also add best combo of veggies like brinjals, potato and carrots, as it enhances the nutritional value of the sambar.