You can buy this tea from Auntie Stormstout at the beginning of the dungeon for 5 gold. I recommend buying more than one if you're going to try for this achievement during a run, since the buff only lasts 5 minutes. However, it's probably best to complete the dungeon first and go back so you aren't holding up the group.
With the buff active, you can see Golden Hoplings scattered around the dungeon. Turning on nameplates allows for easier hop-spotting. Track Humanoids abilities also reveal the hoplings on your minimap. Another way to find them is to target and mark them with a macro:
/target Golden Hopling
(Credit to Rakenaid on Wowhead.com)
You need to find 30 hoplings. The final one sits underneath the mask of the defeated Yan-Zhu the Uncasked, assuming you've cleared the place. Once you find them all, you'll earn the Ling-Ting's Herbal Journey achievement, which is required for the Glory of the Pandaria Hero meta.
You'll also receive the excellent Hopling pet in the mail. The only other way to get a virmen battle pet is to collect 250 pets for the Going to Need More Leashes achievement, which is much harder if you don't already have a large collection.
Filed under: Mists of Pandaria