General Information Zenzai December 20, 20150 Sweet-Beans Soup. Zenzai (ぜんざい) is a thick sweet soup with boiled azuki beans as the featured ingredient. It is mainly eaten in winter. Photos by Hiromi Mochinaga. Post navigation Previous Article Katsudon Next Article Boston Roll Leave a Reply Cancel reply This site uses Akismet to reduce spam. Learn how your comment data is processed.