Zinfandel has been called America's grape for a long time; long before DNA testing took it to Primitivo in Italy and farther back to an obscure grape in Croatia. If you really want to know the Croatian name for American Zinfandel, it's usually called Crljenak Kaštelanski, but sometimes Tribidrag. Hey, you asked.
Let's say you are looking to buy a bottle of California Zin. How should you go about that? Some help follows.