Heat the 1 cup oil in a deep heavy-based frying pan until a breadcrumb sizzles and turns brown when dropped into it.
When the oil is hot, add the potatoes, and fry over a medium heat for 5 to 7 minutes, or until just tender. Add the turmeric, red chile powder, sugar, dried mango powder, cumin, and salt, to taste, to the pan. Turn up the flame and continue to fry for 3 to 4 minutes, or until the potatoes are crisp, and golden-brown. Remove the potatoes from the pan using a slotted spoon, and set aside to drain on a tray lined with paper towels.
Meanwhile, in a separate frying pan, heat 1 tablespoon of oil over a medium heat, add the cashew nuts and fry for 1 to 2 minutes, or until golden brown. Add the sesame seeds and fry for another minute, or until the sesame seeds are golden brown.
To serve the dish, place the potatoes into a serving dish. Pour over the fried nuts and seeds, and stir well to coat the potatoes. Serve immediately.
*Can be found at specialty Indian markets. For crispier potato chips, fry the potatoes twice allowing them to cool after the first frying. This recipe serves four. Instead of adding vinegar to your chips, try adding dried mango powder as it adds the same sourness, but doesn't make them soggy.