I see many different answers and most of them are right. It depends on the plane and airline. I 'm an AMT and work mostly on 747's. For example Qantas just have electric convection ovens. All the meals are supplied half cooked, then cabin crew heat/c...
Here is a list of all the leading brands......you'll have to contact each to see if they offer "red" ovens.
"Why did the Soviet Union ban the use of microwave ovens in 1976? Who invented microwave ovens, and why? The answers to these questions may shock you into throwing your microwave oven in the trash."