Cut the boiled, cooled, and peeled potatoes lengthwise into thick, fry-like wedges.
Place them in a large mixing bowl. 2.
Heat a small, heavy-bottomed pan over medium heat.
Add the whole cumin seeds and toast, stirring, until fragrant and slightly darkened.
Add the ground coriander, chili powder, chaat masala, salt, black pepper, and garam masala.
Stir for 5-10 seconds until aromatic, then remove from heat. 3.
Transfer the toasted spices to a spice grinder or clean coffee grinder.
Once cool, grind into a fine powder. 4.
Sprinkle the fresh spice powder, chopped cilantro, and lime juice over the potatoes. Gently toss to coat evenly. 5.
Heat the oil in a wok or large nonstick frying pan over medium heat.
Add the potatoes and stir-fry for a minute until heated through.
Taste and adjust seasoning before serving hot.
Don't overcrowd the pan when frying.
Cook in batches if needed to ensure the potatoes get slightly crispy edges instead of steaming.