Defeat the Ghost of Lin Da-Gu.
<As you open the scroll, you realize your worst fears have come true: the sha energies have corrupted the Lin recipe.><Your only choice is to defeat the released energies in the hope that the scroll can be saved.>
You will also receive:
Ghost of Lin Da-Gu is an elite, but can be soloed if the player pays attention to what the mob is casting and has good gear. (I soloed the ghost as a Troll Fire Mage with a 526 avg. ilvl.) It also helps if the player has all of his or her "uh-oh" cool-downs ready for use in case he or she slips up. (Mages: switch to Frost Barrier and Cauterize.)
!!The deadliest attack and the one the player needs to be hyper-vigilant about avoiding is Boiling Broth!! because the player can't simply dodge to the side. Run behind the ghost when he begins channeling the ability. It hurts.
The second thing to be aware of is Dash of Spice. It actually is a harder-hitting spell than Broiling Broth (200K versus 100K) but it is simpler to avoid; just run around.
Noodles is fairly easy to avoid because they are flung out in straight lines. Just try not to stand in where they land because the slow effect makes avoiding Broiling Broth much more difficult.
The quest can be completed in both Normal and Heroic modes of Temple of the Jade Serpent.