Cut of Raw Ribs

From UOGuide

A Cut of Raw Ribs is a Food item primarily used as an ingredient to produce other food items by players with the Cooking skill. They are an easily obtained loot item from nearly any creature killed in the game by using a blade on a corpse. They can also be bought or sold to NPC vendors in towns, usually in a butcher's shop, and this was often a primary gold-making method for young players in years past.

It cannot be consumed by a character unless it is cooked. They're usually used to produce a Cut of Ribs (cooked version) to eat but are also often used to feed Pets. It takes no Cooking skill to turn a raw rib into a cooked Cut of Ribs.