1Peel and dice the potatoes into medium-sized cubes.
Finely chop the onion, tomatoes, and green chilies.
Heat the vegetable oil in a large pan over medium heat.
Add the chopped onions and sauté until they turn golden brown.
Add the ginger-garlic paste and sauté for another 2 minutes.
Add the chopped tomatoes and green chilies, and cook until the tomatoes become soft and mushy.
Add the turmeric powder, red chili powder, and salt. Mix well.
Add the diced potatoes and stir to coat them with the spice mixture.
Pour in the water, cover the pan, and let it simmer for about 15-20 minutes or until the potatoes are tender.
Once the potatoes are cooked, add the garam masala and mix well.
Garnish with fresh coriander leaves and serve hot.