noun
Refers specifically to the black variety of soybean, often used in Japanese New Year's dishes (osechi) and traditional sweets.
おせち料理には黒豆が欠かせません。
Black soybeans are indispensable in osechi cuisine.
黒豆を甘く煮て食べる。
I simmer black soybeans with sugar and eat them.
Soybean in general; 黒豆 is a specific variety.
Compound of 黒 (kuro, 'black') and 豆 (mame, 'bean'). The reading くろまめ is a straightforward combination.