The Cursed Caulron outside Zeth'Gor
The Cursed Cauldron is a large cauldron in front of Zeth'Gor in Hellfire Peninsula. [65, 72]
Objective of
The cauldron can be used to boil the [Bleeding Hollow Blood], giving you 
[Boiled Blood] for the quest 
[60] Boiling Blood.
Notes
When you use the cauldron with the blood, a large number of scarabs will appear and scurry around for a bit. You can either use Area of Effect spells to clear them out or you can just back away from the cauldron. The scarabs will despawn about about 20 seconds.