Take 1/2 cup toor dal along with 1/8 cup moong dal.Rinse it well.
Add to cooker along with 2 cups water, 1/2 teaspoon oil and 1/2 teaspoon turmeric powder. Pressure cook for 5 to 6 whistles or until mushy.
Let the pressure release by itself.
Open and mash it well with a laddle. Set aside.
To a bowl add 2 tablespoon tamarind, soak in around 1/2 cup warm water. Crush it roughly and set aside for 15 mins.
After 15 mins crush well to extract the pulp. Tamarind extract ready.
Now to a pot heat 2 teaspoon oil - add around 10-15 small onion,1 big tomato ,1 long green chilli
Saute for few mins until tomatoes turn mushy.
Add cooked, mashed dal to it.
Rinse the cooker with 1 cup water and add it. Mix it well.
Cook covered for 10-12 mins for the veggies to get cooked. Open.
Check if carrot is cooked. Prick with a spoon or fork if it easily goes through then its done else cook for few more mins.
Strain and add tamarind extract.
Add 1 teaspoon kashmiri red chilli powder.
Mix well and let sambar boil. Meanwhile we can prepare the tadka.
To a tadka pan - heat oil. add 1 teaspoon mustard seeds, 1/4 teaspoon urad dal, a generous pinch hing, few curry leaves and let it splutter. Finally add 1 heaped teaspoon sambar powder give a quick mix and switch off. Do not burn so switch off immediately.
Add this to boiling sambar.
Mix it well. Boil for 3-5 mins.
Finally garnish with 1 tablespoon chopped coriander leaves, 1 teaspoon sugar and switch off. Hot tasty idli sambar ready.