From Minecraft Wiki
dec: 363 hex: 16B bin: 101101011
Cows and mooshrooms that die while on fire will drop steak instead of raw beef.
Raw beef can also be used to heal or breed tamed wolves.
 As a cooking ingredient
Raw Beef +
|1.8||Added in the Adventure Update. Raw Beef was introduced as one of the new food items dropped by cows in addition to their leather.|
|1.4.2||12w37a||Texture changed from to (The item sprite no longer has a dark outline).|
|Pocket Edition Alpha|
|0.4.0||Added raw beef.|
|0.9.0||build 1||Added raw beef to creative mode.|
|TU5||Added raw beef.|
|TU12||Texture changed from to (The item sprite no longer has a dark outline).|
Raw Beef and Steak in a preview screenshot.