I've been told that most white truffle oil is fake.
Is this true? How do you determine whether it is fake? All of the white truffle oil I've bought has a sliver of truffle floating around in the bottle... surely that is enough proof?
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This is true, most truffle oil is not flavored with truffle, it is rather flavored with dithiapentane(an odorant). You should be able to tell by the label if it is in fact flavored by the actual truffle or dithiapentane. Not sure I would say that a sliver of truffle in the bottle would be enough to know for sure.
On a side not I recently had the opportunity of meeting chef Sergi Arola of La Broche, who While he was shaving some fresh truffle said that truffle oil was one of the worst ingredients that he has seen chefs use, and that people need to just stay away from it.
I have to admit the real truffle shavings were amazing, but not all of us can afford them.