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.