I probably know more about Italian olive oils than I should, I work for an Italian agriturismo and we specialize in culinary and cultural immersion tours that visit frantoio's and wineries.
The vast majority of olive oil exported from Italy (and Spain, Tunisia, and Greece) is a blend, each olive tree produces very little oil, only about a liter per tree. And that oil is very, very expensive. Olives are harvested once a year, in late October/early November, and the pure oil is only good, if kept in a dark place at 65 degrees or less, for one year. Each olive is hand picked, any olives that hit the ground are bruised and cannot be used or it throws the whole batch off. Then the olives must be hand cleaned, removing twigs and leaves, washed in cold water, pressed between granite stones slowly so the friction doesn't generate any heat, placed on straw mats and the oil drained, and bottled within 24 hours or they go rancid. Italians don't use olive oil for cooking, only as a condiment to season already cooked food or to flavor foods like bruschetta, panzanella, or make an olivada. The oil Italians use for cooking is sunflower.
Oils that can be designated extra virgin in the US cannot be designated extra virgin in Italy which has strict government laws about quality control. Only oils that are hand-picked, traditionally pressed, from the first pressing, have no chemicals added during the processing, and of an acidity of less than 1% can be designated extra virgin. But oils for sale in the US have much lower standards, it can be as much as 70% of other oils!
I have searched high and low, and with an unlimited company budget, for real DOP extra-virgin olive oil imported from Italy, and basically, gave up. You just can't get it here unless you know someone who goes to Italy and can bring you back some. (and, OMG if you ever taste it, your eyes will roll into the back of your head with ecstacy!) The best you can get is a better quality blend.
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