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We call these black soybeans kuromame (黒豆) or kuro daizu (黒大豆). The most famous black soybeans are from Tanba region (丹波) and they are very pricey. These are from Hokkaido. Please note that these are black soybeans, not black beans.
The popular black soybean dish is Kuromame. It is one of Japanese traditional New Years’ meals called Osechi Ryori and it’s served on New Year’s Day.
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