In North India, papads are flame-roasted by placing them on a metal rack, a few inches above a burner. Once exposed to the heat, they will expand. Move the papad around quickly and evenly so it won't burn. Repeat to another side. In the South, they are deep-fried in oil. Once in hot oil, they will expand and sizzle. Remove with tongs and place on paper towel to remove excess oil.