Preserved Threshadon Meat

Preserved Threshadon Meat is a quest item given for The Bait for Lar'korwi. The "Flat Un'Goro Rock" is a small area with giant dinosaur bones located among the eastern mountains of Un'Goro Crater. More specifically, it is the area behind and east of the Eastern Crystal Pylon.

Source
Is found within Torwa's Pouch for the quest The Bait for Lar'korwi.