Every March, Central New York shelves are stocked with glass bottles of green dairy.

If you find yourself strolling through a market in Central New York in early March, there’s a good chance you might come across glass bottles of green milk. There’s no need to call the health inspector: This seasonal drink is flavored with mint and colored for the upcoming Saint Patrick’s Day holiday.
Byrne Dairy, a producer based in Syracuse, has been making the mint milk since 1976. It starts appearing in Byrne’s own line of convenience stores and a few indepen...