Soak ½ cup of split pigeon peas into 1 cup of water.
Drain water and add soaked tuvar dal into the pressure cooker.
Then add turmeric powder, salt, and 1 cup of water. mix well and pressure cook dal on a medium flame for 3 whistles.
Mash cooked dal with a masher.
Then add onion petals, drumsticks, carrots, green beans, tomatoes, green chili slits, and a few curry leaves.
Also in a ½ cup of tamarind pulp, add turmeric powder, red chili powder, sambar masala, and jaggery. Mix well and add the paste into the pressure cooker.
Add 1 cup of water and mix well.
Cover the lid and pressure cook on a medium flame for 1 whistle.
When the pressure cooker releases its pressure naturally, open the lid and add the required water for sambar consistency.
Now heat oil in a pan, add oil, mustard seeds, urad dal, cumin seeds, red chili, and curry leaves. sauté till dal is slightly golden brown.
Add tadka into sambar and mix well.
Garnish with some coriander leaves and serve sambar with idli.