Take cooked dal in a pressure cooker, add chopped carrots, onions, tomatoes, coriander leaves, salt, and cumin powder. Add 1 cup of water, pressure cook for 1 whistle.
Once the pressure falls, remove the lid, churn well using the churner. Add the cooked rice, adjust the salt, and pressure cook again.
When the pressure falls, do the tempering with ghee, curry leaves. Mix in the filtered rasam water to dropping consistency.