Tender lentils slow-simmered with warming turmeric, finished with a sizzling tarka of golden ghee, roasted cumin, and fresh coriander.
Combine the tamarind extract, tomatoes, turmeric, mashed dal and 2 cups water with salt in a pot.
Boil 10 minutes until the tomatoes collapse and the rasam turns frothy.
Stir in the rasam powder and simmer 2 minutes, then switch off the heat.
Heat the ghee and pop the mustard seeds, then add the curry leaves and asafoetida.
Pour the tempering over the rasam, rest 5 minutes and serve with steamed rice.