Burnt shark

Burnt shark is the result of accidentally burning a raw shark while attempting to make a shark. Cooking a shark requires 80 Cooking, and burning it will become less common with a higher Cooking level. Sharks stop being burnt at level 94 with cooking gauntlets.

The burnt shark has no use whatsoever, although you can unsuccessfully attempt to eat it. Like most other burnt food, it is tradeable to other players but not on the Grand Exchange.

A hidden update on 4 March 2013 made all burnt sharks stackable.