Vendors chop the layered parotta bread right on the hot griddle using two flat blades, and the loud, rhythmic clanging of metal on metal is so distinctive that a kothu parotta stall can be picked out by ear before it's seen.
Leftover or freshly made parotta is torn and minced on a griddle with egg, chopped onion, chili, and a curry of meat or vegetables, all worked together with a chopping and tossing motion using two flat metal blades. Roadside 'military hotels' and late-night parotta stalls across Tamil Nadu serve it hot straight off the tawa.