Battle Dishes

Battle Dishes are food items that are consumed by players to receive a buff intended to aide them in battle. Only one Battle Dish can be consumed at a time, and if a player consumes a second dish, it wll replace the effects of the first one. The buff generally lasts 15 minutes, and entering a Battleground will cancel the effect.

Source
These items are acquired by:
 * Crafting them using the cooking skill
 * Trading with other players for them
 * Purchasing them from the Trade Broker