For a long time, Zinfandel's history has been much disputed. Originally thought to be a descendant of Puglia's Primitivo in southern Italy, extensive DNA profiling by UC Davis has established that Primitivo and Zinfandel are actually offspring of Crljenak Kaštelanski, a virtually extinct variety recently identified on the Croatian island of Kaštela. Planted widely by miners turned farmers in California’s gold rush, it thrived in the warm, sunny, and dry conditions. While it grows well across most of California. Some of the finest examples come from Sonoma, Paso Robles and the Sierra Foothills in particular. A good Zin should be bursting with big, ripe, jammy fruit, peppery spices and have good levels of tannin and acidity giving it backbone and structure.