It’s all in the name.

“Oinomancy (or oenomancy or œnomancy) is a form of divination conducted by examining patterns in wine. An ancient technique, oinomancy was performed by a priestess known as a Bacchante, and protected by Bacchus, the Roman god of wine. Oinomancy is still practiced today, but is rare in the United States.”

– Wikipedia

http://www.dcs.ed.ac.uk/home/jhb/whisky/swa/chap6.html