There are a number of reputable olive oils you can buy that aren't fake. I buy from the costco lineup personally. We prefer Ottavio, the one from Spain, but I believe the Kirkland Brand was also tested.
Also, can you elaborate more on why you don't use plant fats for cooking? We do the opposite here, so I'm curious.
Yup, Costco is a great source. I emailed them and asked about the fake oils. They said they do random testing of every shipment.
First, I avoid most of the m vegetable oils in general. Not just for cooking. The only exceptions is olive and coconut. Most oils are high in omega 6 fatty acids. This skews the ratio of omega 3 to omega 6 that our body desires. But cooking or heating the oils makes them even worse. It destroys good properties, oils become rancid / oxidizes during heating.
I just don’t see the reason to even use veg oils. Food tastes so much better cooked in butter or ghee, or bacon fat, or beef tallow.
Also, can you elaborate more on why you don't use plant fats for cooking? We do the opposite here, so I'm curious.