There are many ways to cook a potato. Can be fried, baked, boiled, even grilled. However, I would turn it into a curry instead. A potato curry that goes so well with your rice and curry.
Then throw in the diced tomatoes and let it cook for another 3 min.
Add the methi/fenugreek seed, turmeric powder and if you prefer the curry to be spicy, add chili powder as well to the pot and mix well.
Finally, add the salt and the cut potatoes pieces to cook for about 5 min.