Kykeon
From BurnZero
Kykeon (from the Ancient Greek: "to stir, to mix") is widely believed to be psychedelic beverage used in the Eleusinian Mysteries[1] as an initiation rite in the Telesterion hall.
Ingredients
Kykeon was thought to be made of mainly water, barley and naturally occurring substances. Others were thought to be made of a combination of wine and grated cheese[2].
References