Cut a slit in a baguette, fill it generously with sweet red bean paste, and toast it until golden brown. Place a dollop of slightly salty butter between the hot, freshly toasted bread slices, and you'll have a delicious sweet and salty red bean paste and butter sandwich. It's easy to make, making it perfect for a home café menu or a quick breakfast. The crispy outside and fluffy inside texture, along with the sweetness of the red bean paste and the saltiness of the butter, create a perfect harmony of flavors.