1. Heat oil in a large heavy bottomed pan. Add cumin seeds to this oil.
2. When the cumin seeds splutter add onions and saute until the onions become transparent.
3. Add turmeric and saute for a few seconds.
4. Add tomatoes, salt and chilli powder and saute until the tomatoes are cooked and become soft
5. Garnish with cilantro and sev just before serving and serve hot with bread, roti or plain rice.

Courtesy: http://veginspirations.blogspot.com/