Black soybeans are rich in both history and nutrients. To start with its ancient past, black soybeans have long been an important culinary ingredient dating back nearly 5,000 years to their native east Asia. Their benefits include fiber, iron, calcium, B vitamins, zinc, lecithin, phosphorus, magnesium – and if that wasn’t enough, they are over 35% protein by weight. And they hold the title for being the only bean to contain all nine essential amino acids.
Fun fact: Evidence of soybeans date all the way back to 165 BC where they have been found in a tomb of the Han dynasty – wow – but the first variety of black bean wasn’t introduced to the US until 1889, where an agriculture professor brought them back after traveling to Japan.