
1) Ancient Greek cuisine 2) Entheogens 
Found on 
https://www.crosswordclues.com/clue/kykeon

 Kykeon (Gr. κυκεών, from κυκάω, `to stir, to mix`) was an Ancient Greek drink of various descriptions. Some were made mainly of water, barley and naturally occurring substances. Others were made with wine and grated cheese. It is widely believed that kykeon usually refers to a psychoactive compounded brew, as in the case of the Eleusi.....
Found on 
http://en.wikipedia.org/wiki/Kykeon

(from the article `drug cult`) ...used wine in Dionysian rites, and circumstantial evidence points to the use of a hallucinogenic substance in the most solemn moments of the ... ...the writings of the early Church Fathers (e.g., Clement of Alexandria) and some Gnostics (early Christian heretics who held that matter was evil ... [2 re...
Found on 
http://www.britannica.com/eb/a-z/k/60

a drink made from grain and pennyroyal that was used traditionally in the Eleusinian Mysteries in ancient Greece.
Found on 
https://www.encyclo.co.uk/local/10135
  No exact match found.