1. Heat oil in a large heavy bottomed pan. When hot add cumin seeds to it .
2. When the cumin seeds start to splutter and onions and saute until onions are transparent.
3. Then add tomatoes and saute until tomatoes become soft and mushy.
4. Add turmeric powder, chilli powder, coriander powder and cumin powder and stir for a few seconds.
5. Add the cut white part of the melon, salt to taste, sugar (if using) and a little water (about 1/4 cup) and on medium heat let the melon cook.
6. In the meanwhile powder the roasted unsalted peanuts and almonds in a spice grinder and keep aside.
7. When the melon is cooked, add powdered peanuts + almond mixture and ketchup to it and let it simmer for a couple of minutes.
8. Garnish with cilantro and serve hot with rice or roti (Indian flat bread)

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