The Miami Airport show that aired on Travel channel (I think?) had an episode last year where they showed the meal prep kitchen and process from start to finish. It was probably one of the more interesting episodes actually, and highlighted the fact of how clean and sanitary these places need to be. I think they were preparing the Alitalia flight's meals, it was interesting to see and I appreciated the details and work that went into the preparation. You never think about it until you see it laid out like that.