紅豆 is red bean) (紅 is red, and 豆 is bean). 汤 is soup, so 紅豆湯 is red bean soup.
About This Dish
Red bean soup is a sweet soup served as a dessert at the end of meals, made with adzuki beans), water, rock sugar, and varying other items mixed in such as taro, sago), lotus seed, and citrus peel (made from mandarin oranges.