Epcot’s Japan Pavilion is one of my favorite areas in the World Showcase, so I was extra-fascinated when AllEars posted a review of all the fun snacks available in that area: http://allears.net/2019/06/16/allears-tv-why-you-should-definitely-try-the-crazy-snacks-in-epcots-japan/ .
I strongly suggest trying the ramune (flavored soda similar to Sprite/7up) and the mochi (rice cake with filling, typically some kind of fruit).