Four fire engines and around 25 firefighters tackled a fire at a flat on Northbrook Road in Ilford.
The majority of the kitchen was destroyed by the fire. One man was rescued from the first floor flat roof by firefighters using a short extension ladder.
The fire is believed to have been accidental and caused by incense sticks placed too close to combustible materials.
A London Fire Brigade spokesperson said: "Incense sticks, candles and oil burners are one of the most common causes of fire within homes. It’s really important that you never leave these items unattended.
"Make sure you place incense sticks in a suitable, fire-resistant holder and keep them away from curtains and anything else that can easily catch fire. Remember to put them out entirely when you leave the room and especially before bed.
"We also recommend taking some time to carry out a few simple checks to keep yourself and your loved ones safe. The Brigade’s online Home Fire Safety Checker can guide you around your home and provide you with specific advice to reduce fire risks.”
Control Officers took the first of two calls at 1227 and mobilised four fire engines and around 25 firefighters from Ilford, Barking and Stratford fire stations to the scene. The incident was over for firefighters at 1252.