The Minamoto Kitchoan kiosk at Mitsuwa in New Jersey is selling a special hands-on summer wagashi. I think it’s arrowroot with agar agar and extra water, mizu. The jelly prism is placed inside a plastic box and pushed through a screen that cuts it into small, spaghetti-like ribbons. A small packet of molasses is included and could be used as a sauce for the jelly noodles. The whole set is only $6.