Thistle Tea

Thistle Tea is a drink used to restore the energy of rogues. The beverage was discovered by the night elf Arantir while adventuring in Darkshore in his youth.

Source
This item is crafted with Cooking (60); taught by Recipe: Thistle Tea. This recipe is sold only to rogues by Smudge Thunderwood in Alterac Mountains.

This item is a quest reward from the following quests:
 * Plundering the Plunderers
 * Horns of Nez'ra (quest)

Trivia

 * Thistle Tea is a rare Rogue spell in the Whispers of the Old Gods expansion for Hearthstone. The flavor text reads: "Aren't Thistles prickly? Why would you drink them? I don't get Rogues."