The best olive oil comes from Italy or Spain, right? Maybe so, but California olive growers are working to change that. In recent years, growers around the state have been making a big investment taking extreme measures in an effort to create great domestic extra-virgin olive oil. (For example, U.C. Davis recently opened the Olive Center, with 30 faculty researchers, acres of olive groves, and a new olive press—all with a focus on oil.) But are their efforts justified? Wondering if California already sells olive oils as good as America's favorite imports, America's Test Kitchen anonymously purchased 10 extra-virgin oils from the state's largest and most established producers to see if a domestic oil could replace Europe as the winner in this intercontinental battle. Watch the video taste-testabove for information about the winner, or read the full comparison on AmericasTestKitchen.com (free registration required).