Unethical Food Pricing

I flew JetStar to Hong Kong. It was lunch time, so I took the menu from the seat pocket and chose my meal. When the staff got to my seat, they said they had my selection but that the price was more than double the price on the actual menu.

When I showed them the menu, they claimed that the menu was from a "different route with lower taxes" and that's why the prices are lower on the menu. It looked and seemed really dishonest. It may well be true, but what taxes could account for a 125% price difference? Other customers were complaining about it as well. I've never experienced something similar in an airline before.

I complained to JetStar when I got back and they opened a case, but this morning I got a note back saying they had closed the case and apologised for their food selection. Idiots.

International
China-Haikou
Hong Kong-Hong Kong