Soak tamarind in a cup hot water.
Switch on the Instant Pot in saute mode. When it is hot, add the oil, mustard, redchilies, and fenugreek. When mustard seeds splutter, add the curry leaf and asafetida, fry for 30 seconds. Add the onions and saute for 2-3 minutes.
Add the tomatoes, veggies, dal, turmeric and one and a half cup water.
Cancel the saute mode and pressure cook for 2 minutes. Release the pressure, mash the dal a little. If you have time, let the pressure release naturally.
In the meantime, extract the tamarind juice. Use another one and haf cup water for the same. Add the tamarind juice, sambhar powder, and salt. Mix.
Switch on the Instant Pot in Soup Mode and simmer for 4-5 minutes.
Transfer to serving bowl, garnish with cilantro, and serve with idli, dosa, pongal, or upma.