B767 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Diverted; Flight Crew Landed As Precaution; Flight Crew Landed in Emergency Condition
Human Factors; Aircraft
About 200 nm East of ZZZZ the passengers and crew smelled a burning oder.  We requested priority handling; departed the track and diverted ZZZZ.  Weather was 100 overcast and 1/4 mile visibility.  We executed a CAT III approach and landed safely.  We taxied to the gate with no complications.  The passengers and crew deplaned shortly after getting to the gate.Cause: tin foil was found in the galley's oven exhaust fan. Clean the ovens.
While at cruise in the vicinity of ZZZZZ Intersection; we detected an odor that smelled like food burning. The cabin crew as well as the FO and Relief Pilot were unable to determine the source. The Captain decided to divert since we just entered our oceanic crossing point heading eastbound. Requested priority handling and we turned and descended off the track towards ZZZZ because that was the only airport we could attempt an approach due to weather. Checklist procedures were completed and when the utility busses were turned off the smell dissipated. We landed safely at ZZZZ.Later it was determined that a piece of foil containing some food on it got stuck in one of the galley oven fans. As the food smoldered it made an odor that went through the entire aircraft. Shutting off the utility busses turned off the galley ovens thus removing and dissipating the smell.
B767 flight crew reported being notified by the flight attendants of a burning smell in the cabin during cruise prompting a diversion and uneventful landing.  Reportedly; the smell was caused by tin foil found in the galley's oven exhaust fan.