1. Cut sweet potatoes ,elephany yam and carrots into small cubes and fry separately .
2. Fry onions till light brown .
3. Add chopped tomato and cook for a few minutes .
4. Add turmeric and chilli powder and all the fried vegetables ,green pass and whole tomatoes .
5. Mix well together . cover and cook for another 2 to 3 mins.
6. Add sugar ,salt and vinegar .Simmer for 5 minutes and serve hot .
7. Add 2 to 3 whole green chillies if desired .