Collaboration with the long-established Japanese paper shop 'Nihonbashi Haibara'! In a stylish and elegant small box made by Haibara, we deliver a delicious castella filled with sweet potatoes and a crisp crunch. The rich and famous sweet potato Haruka Beni, baked once to bring out the sweetness of the honey, is generously scattered over the dough for a luxurious castella. Fragrant Hokkaido butter is kneaded into the castella dough, allowing the sweetness and moistness of the sweet potato to blend seamlessly with the entire castella, resulting in an elegant sweetness. Although sweet potatoes are sweet and have a high sugar content, they are not overly sweet, making them a sweet that can be enjoyed by all ages. *This product has not been cut. Cut into bite-sized pieces and enjoy.