I believe that the "chateaubriand for two for one" was coined in the Equatorial hotel in Singapore. "Actual" meal entitlements were accumulated through the day to pay for a decent repast. When on rates, roughly £15 for breakfast and £20 for lunch/dinner, eating on the ground (EOG) was actively discouraged in favour of contributions to the "kitty". That's why, when down the route, the first tray of in flight sandwiches disappeared before start checks in the morning.
Dougie M ex 188 Cse South Cerney