Press SAUTE on Instant Pot. Heat oil (or ghee), and add mustard seeds, and cumin seeds. Let them crackle.
Then add dried red chili, curry leaves, and asafoetida and saute for a few more seconds.
Then add the onions and saute till the onions turn soft.
Then add tomatoes, sambar powder, turmeric powder, red chili powder, salt and cook for another 1-2 minutes.
Then add rinsed toor dal, water, mixed vegetables and give a stir.
Close the lid securely, and turn the vent to "SEALING". Select the PRESSURE COOK/MANUAL (High Pressure) setting and set the cooking time to 8 minutes.When the instant pot beeps, allow the pressure to release naturally for 10 minutes, then release any remaining pressure before removing the lid. Open the lid, add tamarind extract, jaggery and mix. Adjust spices at this stage. Simmer for 1-2 minutes. Lastly, garnish with coriander leaves.
Serve Instant pot South Indian sambar hot with rice, quinoa, or idli.