A quarter of samples of dried oregano have been found to contain other ingredients in the latest in "a long line of food frauds".
Professor Chris Elliott, the Director of the Institute for Global Food Security who authored the report into food fraud following the horse meat scandal, examined samples from a range of shops in the UK and Ireland and from online retailers.
The study found 19 out of 78 samples of the herb contained added ingredients - most commonly olive and myrtle leaves - which made up between 30% and 70% of the product.
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