Boil the tomato in water until it becomes soft. Switch off the flame and allow it to cool.
Meanwhile, grind pepper, cumin seeds, garlic, mint leaves, green chilli, and coriander stems coarsely without adding much water.
Once cooled, crush the boiled tomato directly in the same water.
Add the coarsely ground mixture to the crushed tomato water.
Add turmeric powder, curry leaves, hing, salt, and coriander leaves.
Place the rasam on the stove and allow it to heat and gently boil.
When it reaches a boiling stage, add the tamarind extract and mix well.
Do not boil for long after adding tamarind. Switch off the flame once the rasam is heated through.
Serve hot.