In no particular order:
North Sea shuttle, SP in a 212 and lunch was served during a running refuel: airborne to discover a (very) large plate full of rice and curry along with eating tools. Only solution was to drop the window and turf the lot
Rig support off Eire where a chance comment to the cook that the smoked salmon sandwiches yesterday were much appreciated, led to a routine sandwich with more smoked salmon than bread. We'd take the lot back to the hotel and have a proper feed later!
Nigeria where the ice cream from the American rig was to die for, but no room for anything else
Bombay High where the curries were akin to a nuclear sunset: to be consumed at your own risk.
10 hour day flying SP in a Wessex from northern WA to just off Timor-est and back, sandwiches and lots of liquid in 37C
12 hour days on fires throwing water at the ground where any food and water is welcome, often provided by supporting locals who value the work done to protect their homes. That's always humbling.
Lots more spring to mind, but anyone who considers eating in flight to be 'poor airmanship' is living in a dreamworld.