Cut the kabocha pumpkin into half and scoop out the middle to remove the seeds, and cut into preferred sizes. Wash the adzuki beans in cold water.

In a pot, place the adzuki beans and water and simmer on medium heat. Once it comes to a boil, pour away the boiling liquid. Pour in fresh water again and simmer till the adzuki beans are cooked through. Top up the boiling liquid with water if it runs out.

Once the adzuki beans are soft, add in the sugar and continue simmering.

Add in the kabocha pumpkin into the pot and continue simmering until the pumpkin becomes soft.