Grind cumin seeds, peppercorns and ginger to a fine paste. Wash curry leaves and pat them dry. Heat the ghee in a kadai.
Season with mustard seeds, curry leaves, whole red chillies and toovar dal. Mix together cumin paste, red chilli powder, turmeric powder, salt and add a cup of water to prevent the masalas from scorching.
Cook the masala for two to three minutes. Add three more cups of water and bring to a boil. Add jaggery and tamarind pulp and simmer on slow heat for another four to five minutes. Serve hot.