Heat oil in a pan.Add mustard seeds.When they splatter add cumin seeds and fennel seeds, green chilli, curry leaves.
Then add hing and tumeric powder. Add diced potato. Season potato with salt so it starts cooking faster. You can cover pan to cook potato faster in the beginning but be sure to cook uncovered later for best crispy potatoes.
Cover and cook on low flame till potatoes are cooked.Stir at regular intervals so that the potatoes dont stick to the pan
Add red chilli powder,and dhaniya jeera powder.
When potatoes are done, add sugar and lemon juice and mix very well.