top of page

Black Beans

Black beans are traditionally cooked by soaking them in water for half a day and then boiling over low heat for 8 hours. You must keep an eye on the gas stove during this whole time. With Cook-zen, you can make delicious black beans in under 50 minutes.



1 cup (100-150g) black beans (Tamba Sasayama)

1 and 1/2 cup (150g) sugar

1 tsp baking soda

3 cups (540cc) water

* Measure with the measuring cup attached to the Cook-zen.

* The weight of one cup of black beans varies depending on the size. One cup of large black soybeans from Tamba weighs about 100g.

  1. Rinse the black beans with water. Remove any floating beans or debris.

  2. Put 3 cups of water in a bowl and let the black beans soak for half a day.

  3. Put the black beans from step 2 and baking soda into the Cook-zen. Set the inner lid to the "open" position. Place the Cook-zen inside a heat-resistant bowl, and heat it in the microwave for 20 minutes. Please use a heat-resistant bowl as it may boil over.

  4. The water from step 3 will turn black, so discard all of the water. Add 3 cups of fresh hot water and 1 cup of sugar. Set the lid, place the Cook-zen inside a heat-resistant bowl, and heat it in the microwave for 15 minutes. Add the remaining 1/2 cup of sugar and heat for 10 to 15 minutes. After heating, let it cool completely.

  5. Once the black beans from step 4 have cooled completely, put them in a storage container with a lid, and store them in the refrigerator without discarding the water.


  • Always use new black beans.

  • Throw away all the hot water that has been heated with baking soda, and be sure to add new hot water.

  • Add sugar in two portions and gradually soak the beans with sweetness.


bottom of page