Cook black soy beans easily by using a pressure cooker. If you use this method, there's no way you can fail! The ones sold in stores are way too sweet, so I make these mildly sweet for my family.
I made this recipe because I wanted to eat mildly sweetened kuromame for the New Year's meal.
I usually make this with 150 g of sugar, but you could adjust the amount to your preferences.
Enjoy Japanese food around the world.