Kintsuba, a traditional Japanese sweet, primarily features red bean paste as its classic filling. However, there are numerous alternative fillings available, including white bean paste (shiroan), sweet potato paste (satsumaimo), chestnut paste (kurikinton), sesame paste (goma-an), fruit fillings like strawberries or blueberries, and matcha (green tea) flavored variations. These fillings provide a range of flavors and textures, allowing for diverse and seasonal interpretations of this beloved treat.