Taverns can be placed in a town to increase the happiness of the citizens that live near them. The happiness bonus is only applied to taverns that have a stock of ale.
A brewer works at a tavern and is required to ferment wheat and fruits into ale.
When the tavern is low on the materials needed to make ale, the brewer will travel to the nearest storage barn that has them and bring them back to the building. They will then begin fermenting the resource into ale.
After ale has been made, it will be stored in the tavern for idle citizens to enjoy.