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In water, allow tamarind to marinate overnight. The next day, strain the juice and reserve.
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In a large saucepan, add the tomato, salt, and turmeric to the tamarind juice and bring to a boil. Boil until the smell of tamarind lessens.
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Saute the peppercorns, chilies, coriander, chickpeas, and cloves until pink.
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Remove from heat. Grind mixture with coconut and form a soft paste.
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Add the paste, pigeon peas and curry leaves to the tamarind juice. Bring to a boil then remove from heat.
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In a small amount of oil, heat mustard seed and hing to season the mysore rasam.
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Ladle into bowls, garnish with coriander leaves, and serve.