If you've been following any of the big news stories on food fraud lately — you'll know that it's tough to know what exactly is in our food — and where it's been before it makes onto our dinner plates.
Earlier this year, Wal-Mart was sued for stocking tubs of Parmesan cheese that contained wood pulp filler. Olive oil is often mixed with sunflower oil and sold as "extra virgin." And you might recall the great European horse meat scandal of 2014: Traces of horse meat were found in Ikea meatballs and Burger King beef patties, in . . .
