I want to know the answer to the following question:
When does evidence show the earliest known barley beer was produced?
All the background I'm provided with is that "Some of the earliest Sumerian writings contain references to beer; examples include a prayer to the goddess Ninkasi, known as "The Hymn to Ninkasi", which served as both a prayer as well as a method of remembering the recipe for beer in a culture with few literate people, and the ancient advice (Fill your belly.". Is that enough to answer the question?
Answer: no