KFC fast food restaurants across South Korea recently introduced a bizarre new dip for its fried chicken and it has been raising eyebrows for both its unusual color and flavor – mint chocolate.

In case you didn’t know, a mint chocolate craze is sweeping South Korea these days, and companies are trying to take advantage of it. Major South Korean companies like Starbucks Korea, Haitai Confectionery and Foods, or Orion have all added mint chocolate-flavored products to their lineups. The latest to do so is fast food giant KFC, which recently launched a mint chocolate dip. Featuring a somewhat off-putting light blue color and gooey texture, the unique fried chicken dip recently went viral on social media.

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The ripe berries of the genipa tree, called genipapo, have long been used throughout Central and South America to make syrups and liquors, but for a few years now unripe genipapo berries have become highly sought after for their ability to turn foods blue.

The coloring properties of unripe genipapo berries have been documented since the colonization of South America, when Europeans reported its use by local communities like the Tupinambás and the Pataxós as a temporary tattoo dye, but it wasn’t until 2014 that people learned about its potential to turn food blue as well. It was then that professor and biologist Valdely Kinupp published his book, Unconventional Food Plants in Brazil, where he detailed a process for extracting an edible blue pigment from genipapo berries. Natural blue pigments are very rare in the food industry, so Kinupp’s discovery caused quite a stir which eventually turned into a blue food craze.

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