Japan's traditional summer treat, kakigori (shaved ice with syrup), is making a strong comeback with new store openings and insanely long lines of people queuing up to get a hold of the refreshing sweet. The reason behind the craze is the use of local, natural spring water for the ice. Unlike normal tap water, the spring water's purity helps creates an airy texture that's so light and delicate that the ice will melt in your mouth instantaneously. To sample this 'natural' kakigori, head to the Tokyo Kakigori Sanpo event, which takes place at Tokyo Station and its surrounding areas. Twenty-three kakigori specialists will serve a variety of flavours topped with seasonal fruits. While you're there, visit Granroof (near Tokyo Station's Yaesu exit), where 400 Japanese wind chimes will be displayed to support the summer mood.