Chilagada Dumpa / Sweet Potato Tomato Gravy Curry

First Peel and wash the sweet potatoes. Cut into thin long pieces. Cut onions and tomatoes into small pieces. Heat a thick bottomed pan and add 4tbsp oil. Once oil get heated add green chillies,curry leaves and onions and add little bit salt and fry the onions until golden brown in color. later add turmeric powder and ginger garlic paste to that and fry for 2 more minutes. once it is fried add sweet potato pieces and add red chilli powder and fry for few seconds and add water and close the lid and cook for about 15 minutes , stirring occasionally. When the potatoes are soft add tomato pieces and salt to required taste. Cover and cook for another 5-10 minutes. when the gravy thickens and oozes out oil, add chopped coriander and simmer for 1 min ,and turn off heat.the dish is ready. It taste very yummy with hot rice and papad.