Plug-in the Instant Pot, Set the Saute Mode on for 10 min. It takes less than this .Add oil/ghee to inner pot.
When the display monitor shows HOT, 2-3 curry leaves ,pinch of hing/asafeotida and saute for few seconds.
Add chopped tomatoes, carrots, 1-2 tbsp of rasam spice mix , tamarind paste or water(see below) , jaggery and salt as per taste. Also add 2-3 cups of water.
Cancel SAUTE Mode, close the lid and set the Pressure Cooker Mode On for 10 minutes.
Once the timer goes off, after 2-3 minutes do Quick Pressure Release (QPR).Now you can blend it to fine consistency using a hand blender directly in inner pot. Or, use mixer and blend in small batches. Do it carefully as the mixture will be hot.
Now switch On the SAUTE Mode again for 5 minutes, let the pureed mixture come to boil.