Raw beast meat is dropped by kebbits that are tracked and caught using a noose wand and the Hunter skill.
Level 21 cooking is needed to cook raw beast meat. It can be cooked only on an iron spit to make skewered beast. Cooking raw beast meat gives 82.5 cooking experience when cooked on an iron spit.
For an exhaustive list of all known sources for this item, see here
- "raw beast" may be referring to dr.suess a Grinch steals Christmas, where "roast beast" "rare roast beast!" is served.