Robyn Eckhardt writes: A squeeze of lime to balance the sweetness of young coconut juice and palm sugar syrupKelapa muda (young coconut) juice is a common beverage in Southeast Asia. It usually comes in the form of a whole coconut with its crown whacked off and straw stuck in.After a several-hour crawl through the Sunday market in Rantepao, in Sulawesi's Toraja region, we were thrilled to come across this mobile cart serving up an Indonesian variation of the popular refresher. Even better - it incorporates our all-time favorite Southeast Asian sweetener, palm sugar.  The technique's pretty simple: ...