Combine dal with curry leaves, ginger, green chilies, turmeric and 1½ cups water in a pressure cooker or an Instant pot. Cook until dal is tender and mushy. About 3~4 whistles in the pressure cooker and 8 minutes on High in an Instant Pot. Let the pressure release naturally for 10 minutes, then quick release the reminder. Whisk in 1~1½cups of water to get to desired rasam consistency. Cook on 'Saute' mode until heated through. ½ cup Toor dal or Masoor dal, 4~5 Curry leaves, 1" Ginger piece, grated, 2~3 Green Chilies, slit, ¼ teaspoon Turmeric, 1½~2½ cups Water, divided (plus more if needed)
In a small saucepan, heat ghee on medium heat. Add cumin seeds, crushed black peppercorns and hing. Once the seeds start to splutter, turn off the heat. Pour the spiced oil/ tadka over the dal.
1 tablespoon Ghee, ½ teaspoon Cumin seeds, ¼ teaspoon Crushed Black peppercorns, ¼ teaspoon Asafoetida/ Hing
Stir in the lemon juice and salt. Taste and adjust the salt as needed. Garnish with cilantro and serve warm.
2~3 tablespoons Lemon juice, To taste Salt, 2 tablespoons Cilantro, finely chopped