I have been diligently doing the Cooking quests every day on the test realm, trying to get the purported "pet food" recipe. I even got my hunter in on the action, thinking perhaps it would increase my odds of receiving that recipe. If nothing else I suppose 2 toons running the quest was increasing my overall odds, but I doubt that being a hunter helps because I finally got the recipe today on my druid. For those who haven't seen it yet:
I should also point out that my hunter has run the quest 3-4 times now and only has 1 recipe to show for her efforts. My druid got the first few recipes pretty quickly, but it would appear there is a certain random factor built into the system. So don't be surprised if you don't get recipes immediately when you start doing the cooking quests, it could take a few tries. <<< Update: since the patch went live the recipe drop rate has gone down significantly from when I wrote this based on my test server experiences. Recipes seem to be dropping at a 10-15% rate from the reward boxes >>>
Also, I discovered an interesting factoid about this quest that I thought I'd share. I'm not sure I've encountered this with other daily quests, since they are all the same each day. But I logged in today planning to pick up the daily quest, only to realize I hadn't turned in a previous quest. I went ahead and turned in the quest I had and Mr. Rokk wouldn't offer me another. So apparently you have to turn in your daily quest on the same day you receive it, otherwise it will count for the day you turn it in.
One more thing: I just received a new quest today that I haven't seen before. This makes four total cooking quests that are part of the available pool. This quest involves collecting 2 Mok'Nathal Shortribs and 1 Crunchy Serpent which are combined using a special cooking pot that The Rokk provides to create a "Demon Broiled Surprise". You are supposed to do this using an abyssal's corpse, and while I'm not entirely sure I know what that entails, I will do my best to figure it out.... stayed tuned!
**Update** The abyssal flamebringers in the demon camp south of Ogri'la are the mobs needed for the new cooking quest =)