Wash the toor dal. Add the washed and drained toor dal into the Instant pot, along with turmeric powder, asafoetida and water. Put the lid on.
Turn the Instant Pot Vent to the Sealing position. Press the pressure cook or manual and set the cooking time to 7 minutes.
When the cooking is done and the instant pot beeps, allow the pressure to release naturally for 10 minutes. Release the remaining pressure manually.
Open the instant pot lid and check the dal. It should be soft and cooked well. Remove the cooked dal from the Instant Pot and transfer it to a bowl.
Set the Instant Pot on Saute Mode. Add ghee or oil to the pot. Once hot, add mustard seeds, fenugreek seeds, curry leaves and red chilli.
Add the shallots / small onions and sauté for 2 minutes. Add the remaining vegetables, salt, turmeric powder, Kashmiri red chilli powder (optional) and sambar powder.
Mix once. Add tamarind extract and water. Add jaggery and mix it with the water. Now, add the cooked dal. Give a final mix and put the lid on.
Change to pressure cook mode and pressure cook for 4 minutes. Once cooking is done, release the pressure quickly. Open the lid and give a mix.
Adjust salt if needed and garnish with coriander leaves. Hot Instant Pot Sambar is ready to be served with your choice of main dish.