Fire crews were called to a fire in a chip shop on Sewardstone Road in Chingford, E4 on Friday afternoon.
Eight people left the premises before the Brigade arrived at the scene.
The chip shop, in a row of shops with flats above, was slightly damaged by the blaze. No one was injured.
Firefighters confined the fire to ducting above a cooker in the kitchen, where fatty deposits had caught alight.
The cause of the fire was accidental and believed to be a build up of grease within the ducting system
Four fire engines and around 21 firefighters and officers from Chingford, Woodford and Enfield fire stations attended the incident.
The Brigade was called at 1754 and the fire was under control at 1839.