Well, they are works of art, so...

Well, they are works of art, so... Here's Sakai in PingMag: "...a way to make the beans glossy by boiling them first. That glossiness is a means of showing the deliciousness of the beans visually. When working with beans, I form them like papier-mâché and apply some colours with acrylic paints. Though that part is faked, it is just to show their glossiness realistically."

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