In a wide pan add oil, cumin seeds, urad dal, chana dal, coriander seeds, methi, red chillis and few curry leaves

Now add some onions and garlic paste

Switch off the flame and add coconut

Add a piece of tamarind and garam masala powder.

Blend to smooth paste

In a large kadai add a tsp of oil and saute diced onions till they sweat.

Now add potatoes and fry for a minute

Along with water also add turmeric and salt to taste

Now add beans and cook for a minute

Add prepared masala paste and give a good stir. boil for 5-8 minutes

Add cooked dal

Also add 2-3 cups of water to get desired consistency

Add a small piece of jaggery

Prepare the tempering and pour it to sambar

Add few chopped coriander leaves and give a good mix