- Soak Toor Dal in warm water for 30 minutes. Add a pinch of turmeric powder and pressure cook for 3 whistles In a heavy-bottomed pan add tomatoes, green Chilli, turmeric powder, ginger powder, salt and 1 cup of water Boil for 10-12 minutes till raw smell goes off. Add cooked dal and 1/2 cup of water, mix well. Sprinkle chopped coriander leaves and pinch of sugar; mix well Cook till the rasam becomes frothy Finally add hing and switch off In a small pan add ghee when the ghee is hot add mustard seeds and let it splutter Add it to the rasam Add a pinch of salt and squeeze a lemon; mix well Add the lemon juice when the rasam is cool. Serve.