Boy, Who'd think a book about olive oil would be so interesting. Darn near made me paranoid.
I made a couple of olive oil purchases from two different California growers/sellers. The stuff goes from their hand to mine and no one could tamper with it. Then I did a taste test, hadn't done this before with olive oil.
I have been using a COSCO store brand. Label says, "Extra Virgin Olive Oil, Produced from Italian Grown Olives, First Cold Press'.
When you taste like you are slurping from a spoon that stuff tastes like a well used gym sneaker.
The California product, one a general purpose and two fresh crop, non filtered, both bottled in Oct/Nov are a very nice flavor, the fresh tasting. The non-filtered stuff has a pleasant olive taste to them.
After reading about the adulteration of olive oil in Italy, Spain and Greece I am not so sure I'll ever buy an oil made there again. Tho I am sure there are quality producers there not using other oils to dilute and still get the EV price I don't see how you can trust any of them without some kind of referral. Even the govt. organizations that are supposed to oversee quality there seem to be a party to the corruption.
If you haven't read it, it is quite an eye opener.