Protein mush was a foodstuff comprised of protein, characterized by its soft and viscous texture. It could be served as a prison meal or as a survival ration.
During the Imperial Era, Pau'an medical trainees Fyzen Gor and Greesto Ftrak were taken from Utapau by the criminal group known as the Wandering Star. Subsequently, Utai raiders attacked the transport of their captors. Gor was among the few who survived, and the medical droid from the transport offered its help, which included retrieving protein packs from the debris. The droid suggested serving Gor a canned meal of protein mush, but Gor was too consumed with thoughts of merging droid components with living tissue to consume the mush.
Before the Battle of Jakku in 5 ABY, Norra Wexley, a human pilot of a starfighter in service to the New Republic, was captured on the planet Jakku by stormtroopers of the Galactic Empire. She was then compelled to work at a kesium gas facility. Among the food rations she occasionally received was a portion of protein mush, which she described as tasting similar to the odor of happabore saliva.