Pickup the quest in Dalaran from either Awilo Lon'gomba located at 70, 38 if you're Horde, or from Katherine Lee located at 40, 65 if you're Alliance.
You're tasked with picking up four Infused Mushrooms from the Dalaran sewers and combining them in the deluxe Meatloaf Pan with 2 Chilled Meats.
The sewers are ripe with the mushrooms, however finding them is the hardest part of the quest. You'll need to go around the sewers multiple times in order to get all four. Expect to run into a bunch of other people along the way. There's always at least a half dozen to a dozen people doing the quest on my high population server.
The best places to get the mushrooms I've found has been behind the buildings near the walls. While there are mushrooms littering the hallways and docks they are usually the first to be farmed. So those tucked away in the nooks and crannies are the best bet.
The other component to this is the Chilled Meats. You'll want to have a lot of these saved up
. The best way to do that is to just farm them for an hour once a week. This quest only needs two of them, so the requirement isn't too stiff.
Once you've gotten the mushrooms and Chilled Meats, combine them up and head on out to turn the quest in. You'll be rewarded with a Dalaran Cooking Award and a Small Spice Bag along with some Kirin Tor rep and gold.
If you're doing the quest while leveling, expect to get around 15,500 experience.
New dailies abound and you'll want to get in on the ground floor to raise those critical reputations up! Check out WoW Insider's continuing series of Wrath of the Lich King daily quests.