I work on private business jets and had requests from pax for their favourite burgers, pizzas etc. from fast food companies. These products do not reheat sucessfully believe me. They are only good to eat when they have been freshly made and eaten soon afterwards.
I think there is a trend anyway these days to eat less on aircraft and more healthily.
Keep coming with the ideas though airline food could definately do with some renovation and a bit of sparkle.