Firefighters have issued a reminder of their cooking safety advice following a fire at a shop on High Street, Barnet.
A ground floor kitchen was destroyed by the fire. Four people left the building before the Brigade arrived.
The fire is believed to have been accidental and was caused by a deep fat fryer.
A London Fire Brigade spokesperson said: "Cooking should never be left unattended on the hob or grill - if you have to leave the kitchen, turn off the heat.
“Cooking with hot oil can be really dangerous and the risk increases when you start frying food more than once. All it can take is for you to become distracted for a few seconds and your cooking oil can quickly go up in flames.
“Never fill a pan more than one third full of fat or oil and make sure food is dry before putting it in hot oil – oil and water are a dangerous mix.
“If the oil starts to smoke, it’s too hot so turn off the heat and leave it to cool. We also advise using an electronic deep fat fryer if possible – they have automatic temperature controls and are much safer.
"It's also really important to keep the hob, cooker hood and extractor fan clean too – built up fat and grease can ignite and cause a fire."
Control Officers took the first of five calls at 0515 and mobilised crews from Barnet, Mill Hill and Southgate fire stations to the scene. The incident was over for firefighters at 0645.