Sakura Con 2009 photoshoot by me
GLaDOS (Genetic Lifeform and Disk Operating System)
The recipe for the cake GLaDOS promises Chell has both safe, nontoxic ingredients and strange, dangerous additives. The player can find it on many of the screens in the abandoned offices, though it is mixed in with numbers and scrolls quickly. An easier way is to listen to the blue Intelligence Sphere that drops from GLaDOS in the final battle.