Rinse kuromame and discard any spoilt ones. Then soak it in ample water for at least 3 hours or overnight. Discard the water.
Boil kuromame with ample water in a pot and add sugar, soy sauce and salt. Bring to a boil and then reduce heat. Simmer under low heat for about 3 hours or until soft. Remove any white foam that appears during simmering.
Remove from heat and let it cool. Refrigerate overnight so that the beans will absorb more flavour.
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