Cheesemaking is the art of making cheese, butter, and other dairy products. But mostly: cheese.
Cheese is marked as a Prepared Food and as a Dairy Food for purposes of gift giving (ie. earning favor from NPCs).
Whey and sweet whey can be stacked up to ten per slot. (Normally the game’s rule of thumb is “a full bottle can’t be stacked”, but we’ll see if this makes cheese making less annoying without being too confusing.)