Mmmmmm.... chicken!
No longer obtainable through a quest since the NGE, the Chicken Leg is nowadays considered as a rare item prized by collectors.
It used to be placed in the player's inventory after killing a CL 21 Cannibal Dewback named the Meat Beast in the third of Porcellus' missions for the Jabba's Palace Theme Park. From there, it was possible to keep this item by not completing the delivery back to Porcellus.