Four fire engines and around 25 firefighters tackled a takeaway restaurant fire on Romford Road in Manor Park.
A small part of of kitchen and ducting in a takeaway with flats above was damaged by fire.
The fire is believed to have been accidental and caused by a fault within the kitchen ducting.
A London Fire Brigade spokesperson said: "We'd like to remind restaurant and takeaway owners to ensure they don't have dirty ducting. If you don't clean the ducting in your extraction system regularly, you're at a greater risk of a fire.
"You should also make sure you keep the hob, cooker hood and extractor fan clean too – built up fat and grease can ignite and cause a fire."
The Brigade was called at 1152 and the fire was under control at 1245. Fire crews from Ilford, East Ham and Leytonstone fire stations attended the scene.
Firefighters' top tips for restaurants and takeaways: