heat oil in the pan and crackle mustard seeds,urad dal and chana dal, garlic and fry for half a minute;
further, add finely chopped onions and fry until it gets pale.
when the onions turn pale, add the finely chopped tomatoes, salt for frying, turmeric powder and mix well.
sprinkle little water, Close and cook until the tomatoes are well cooked and it gets together like a oily masala.
Furthermore, add the boiled and cubed potatoes and chilli powder to the onion tomato mixture.
together add salt and garam masala to the dish. Mix well and keep frying in simmer for almost 20-30 minutes until the potatoes are roasted
serve hot with rice or roti