Coconut open, generally see is snow-white coconut meat, but when the phenolic antioxidants in the coconut met oxygen, catalyzed by polyphenol oxidase produced quinones, can make the plant cells quickly discoloration of these quinones, which is similar to the oxidation of apples, the coconut meat may turn purple.
So the coconut juice, coconut meat turned lavender, most of the time is a long time. But because the color is nice, reminiscent of taro-flavored food, was jokingly called taro-flavored coconut.