- firstly, in a large kadai take chopped tomatoes and tamarind juice. 
- also add curry leaves, turmeric powder, salt and jaggery. 
- cover and boil tamarind water for atleast 15 minutes. 
- further add cooked toor dal and water. 
- boil for a minute till the dal turns frothy. 
- now add 2-3 tsp of mysore rasam powder and continue to boil for 2 minutes. 
- meanwhile, in a small kadai heat oil. 
- further, add mustard seeds, hing, dried red chilli and curry leaves. 
- allow the tempering to splutter and pour over rasam. 
- finally, serve mysore rasam garnishing with chopped coriander leaves.