Sith peanut butter was a type of food commissioned by Malak. After the Mandalorian Wars, Revan and Malak went out into uncharted space, and something bad happened. Upon their return, they declared themselves Sith Lords, and started a war against the Galactic Republic. Malak was of the opinion that the universe needed MOAR SITH, so he betrayed Revan and started to put the word "Sith" in front of everything within his own Sith faction, including but not limited to Sith troopers, Sith starships, and especially Sith peanut butter. Historians theorize that that was probably one of few foods left that he could consume without the use of his jaw.