Clean and peel the potato off its skin. Dice it into 2 inch cubes. Soak it in water till its ready to be roasted.
Heat a pan with oil. Splutter mustard and urad dal along with curry leaves. Then, drain the water and add the potatoes cubes to the pan. Stir well so that it gets well coated with oil. Add salt and cook it with a hood in sim for 5 mins.
Remove the hood and stir again so that the potatoes don't get stuck to the pan. If required add oil, else just add the sambar powder and simmer for another 10 mins.
The potatoes get cooked with its own stream and once they are soft, remove cover and cook for another 5 mins. It's ready.
Crispy, spicy potato roast with Curd rice is ready!