Stormtrooper rations
From Wookieepedia, the Star Wars wiki.
Stormtrooper rations were canned, self-warming rations issued to Imperial stormtroopers during their service to the Empire. The grayish, gooey substance did not have a taste, but it met the nutritional requirements of a typical stormtrooper. Each canister of stormtrooper rations bore the Imperial stamp of approval, an assurance that the rations were safe to eat and quite nutritious. This was just basically gray, tasteless gloop.
