Start the instant pot in sauté mode and heat oil in it. Add all the tempering ingredients.
When the mustard seeds and curry leaves start to sizzle, add the pearl onions and sauté for 2 minutes.
Add the chopped tomatoes, sambar powder and salt. Sauté for another 2 minutes.
Add all the vegetables, jagery, toor dal and water to the instant pot. Stir well and deglaze to make sure that nothing is stuck at the base.
Cancel SAUTE. Close the lid and select MANUAL or PRESSURE COOK mode for 8 minutes at high pressure with vent in sealing position.
When the instant pot beeps, let the pressure release naturally. Stir in the tamarind paste. Stir the sambar so it is mixed well.
Garnish with cilantro and sambar is ready to be served.
For additional flavors, you can add more tadka with whole red chilies on top while serving.