Japanese zenzai is a traditional sweet dish made from red beans, typically adzuki beans, which are simmered until soft and sweetened with sugar. It is often served warm and can be enjoyed on its own or with various accompaniments, such as mochi or dango. Zenzai is popular during the winter months and is commonly found at Japanese festivals and in tea houses. The dish is appreciated for its comforting qualities and is a staple in Japanese cuisine, reflecting the country's love for sweet bean desserts.