Archived version: https://web.archive.org/web/20240115080030/https://www.euronews.com/2024/01/15/olive-oil-scams-are-proliferating-how-do-you-spot-a-fake-extra-virgin
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Answer from the article : "simple analysis can unmask the fraud. Like the fatty acids composition test, or the sterol composition, as well as the spectrophotometric constants"
Oh. OK. Easy. Next time at the grocery store I will check that.
In the US, this is supposed to be legit: https://www.californiaoliveranch.com/products/100-california-everyday/41079566074040
They sell blends as well, but the 100% is well tested and is very good