Tsubuan is a traditional Japanese sweet made from adzuki beans. It is a type of red bean paste that is cooked and sweetened, often used in various Japanese desserts. Tsubuan has a chunky texture, as the beans are left partially intact, giving it a hearty feel. This sweet paste is commonly used in treats like mochi, dorayaki, and taiyaki. It can be enjoyed on its own or as a filling for pastries. Tsubuan is popular in Japanese cuisine and is appreciated for its natural sweetness and rich flavor.