Sarrasin (plante) - Wikipédia
Le sarrasin (Fagopyrum esculentum Moench) est une plante à fleurs annuelle de la famille des Polygonacées cultivée pour ses graines consommées en alimentation humaine et animale.
or in English buckweath. :-)
John of Damascus, in a polemical work typical of this attitude described the Saracens in the early 8th century thus: - There is also the people-deceiving cult (threskeia) of the Ishmaelites, the forerunner of the Antichrist, which prevails until now. It derives from Ishmael, who was born to Abraham from Hagar, wherefore they are called Hagarenes and Ishmaelites. And they call them Saracens, inasmuch as they were sent away empty-handed by Sarah (ek tes Sarras kenous); for it was said to the angel by Hagar: "Sarah has sent me away empty-handed" (cf. Book of Genesis xxi. 10, 14).
Sarah, of course, being Abraham's missus, who probably was the first to mistreat a maid (Hagar). Although, since Abraham was 10 generations down from the Ark Builder (and 20 only from Adam) one assumes that attitudes to servants may have strayed much earlier and made it into the smuttier pages of the Enoch Tribune - which unfortunately collapsed when it put up a paywall prior to the Flood.
The Flood of course would have destroyed all copies of the Enoch Tribune for all time, so we are unable to read what people of the time thought about celebrity of biblical proportions.
What is the ceiling of the Sistine Chapel, if not a photo-op? You can't be me, I'm taken
The Online Etymology Dictionary says this is not certain and quotes Sarah.