I've NEVER seen this quest pop up for the cooking dailies in Dalaran. I don't do them every day, but I do check them near enough every day if I've got time, purely just for this quest.

It's the only one I need to complete the achievement, and I've never seen it. Is it just bad luck, or is there something special I need to be doing?

There are two other high level cooks in my guild and they've never seen it either.

Edit: Whoops. Probably should have put this in the quests/professions forums or something. Never mind, eh!