To begin with first rinse toor dal well.
Add dal along with water, salt and turmeric powder to it. Water should be at least 1/2 inch above dal.
Add little water to pressure cooker. Keep the vessel inside the pressure cooker.
Close with lid.
Cover and pressure cook for 5 whistles.
Let pressure release by itself. Remove the vessel.
Mash dal well.
The consistency should be runny.
Now add all the ingredients listed under 'to boil'.
Let it boil for a good 10 mins atleast.
Now add cooked dal to it.
Rinse with water and add it too.
It will start to boil.
At this time, prepare the tadka, heat ghee add mustard seeds, jeera, hing, curry leaves and red chillies. Fry for a minute and switch off.
Add tadka to rasam along with coriander leaves. Let it come to a boil. When its frothy and comes to a boil switch off.
Cool down for few mins then add lemon juice.
Lemon rasam ready!