Thai Galingale Juice
I tried this juice at the floating market north of Bangkok, where it was in one of the stalls on the shore. There were several juices sitting there in large glass vats, and when I ordered the galingale juice (by pointing), the lady who owned the stand ladled a watery purple liquid into a cup full of ice. A Thai friend I was with explained that it's a purple flower called something like chun or chuan, I can't remember exactly. It's pretty difficult to explain the taste - it is similar to the roselle juice in that it kinda tastes like you're eating a flower. But other than than it's slightly sweet and refreshing over ice, great to cool off on the side of the river on a hot summer day in Thailand.
After doing some research as I usually do out of curiosity, I think this juice is made (at least partially) with Black Galingale or Galangal, a.k.a. blue ginger, a root in the ginger family that is used often in traditional asian medicines. I am able to recognize the first two characters on the label as Kha, meaning galanggal, but my Thai is not so good to be able to recognize the rest. If you can read Thai, please help me out and leave a full translation in the comments. Also, if you've tried this juice I'd like to know what you think.