Narrative:

Immediately after being cleared for takeoff, flight attendant called over intercom and said 'I have a fire in the mid galley.' I immediately called tower, relayed report, and requested clearance off runway. First officer talked to tower then while simultaneously my relief first officer went to cabin to assist with portable breathing equipment. He reported back within 5 mins that it had been an oven smoking from food spillage that was overheating. There had been and was no fire. The smoke was dissipating immediately after leaving vents around oven door and ceased when power was removed and door opened.

Google
 

Original NASA ASRS Text

Title: JUST PRIOR TO COMMENCING TKOF ROLL CABIN ATTENDANT RPTS FIRE IN THE GALLEY.

Narrative: IMMEDIATELY AFTER BEING CLRED FOR TKOF, FLT ATTENDANT CALLED OVER INTERCOM AND SAID 'I HAVE A FIRE IN THE MID GALLEY.' I IMMEDIATELY CALLED TWR, RELAYED RPT, AND REQUESTED CLRNC OFF RWY. FO TALKED TO TWR THEN WHILE SIMULTANEOUSLY MY RELIEF FO WENT TO CABIN TO ASSIST WITH PORTABLE BREATHING EQUIP. HE RPTED BACK WITHIN 5 MINS THAT IT HAD BEEN AN OVEN SMOKING FROM FOOD SPILLAGE THAT WAS OVERHEATING. THERE HAD BEEN AND WAS NO FIRE. THE SMOKE WAS DISSIPATING IMMEDIATELY AFTER LEAVING VENTS AROUND OVEN DOOR AND CEASED WHEN PWR WAS REMOVED AND DOOR OPENED.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.