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Fry (temper) mustard seeds, cumin, urad dal, curry leaves and green chillies (add one ingredient at a time).
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Add onions and sauté till the onions are half cooked.
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Add the tomato and sauté for a few minutes.
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Add the turmeric, salt and keep aside (in a closed dish).
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Add the curd and whisk just before you serve.