Peel and cut the potatoes into medium-sized cubes.
Boil 4-5 cups of water with salt, then add the potato cubes and boil for 8-9 minutes on high heat. Once cooked, remove them from the hot water and let them cool slightly.
In a blender, add ½ cup of coriander leaves, ¼ cup of mint leaves, 3 green chilies, 1 inch of ginger, 4-5 garlic cloves, salt, 1 tsp sugar, 1 tsp lemon juice, and 1 ice cube. Grind to make the chutney and set it aside.
In a pan, heat 4 tbsp of oil, then add 1 tsp cumin seeds, a pinch of hing, and some curry leaves. Add ½ tsp turmeric powder and mix well. Stir in the boiled potato cubes, add salt, and sauté for 2-3 minutes to achieve a slightly crisp coating.
Add the prepared chutney, 1 tsp coriander powder, 1 tsp cumin powder, a pinch of black salt, ¼ tsp black pepper powder, and ½ tsp chaat masala. Mix well, add 3-4 tbsp of water, cover, and cook for 5 minutes on low heat.
Finally, sprinkle in some red chili flakes and coriander leaves, mix well, and serve hot with