- Pour azuki beans into a pot, and fill with enough water to cover.
- Allow beans to soak overnight (at least six hours).
- Pour out the water and rinse the beans a few times.
- Pour clean water into the bowl to cover the beans (about 1 or 2 inches above).
- Bring to a boil at high heat.
- Turn off the heat and cover. Let stand 5 minutes.
- Drain beans and put back in pot with fresh water, again covering the beans.
- Bring to a second boil, then simmer on medium heat until softened (about 1 hour).
- Pick up a bean with a slotted spoon, and gently cool it off with cold water. Then, squeeze it between your fingers - does it easily crush? If so, the beans are done!
- Add the sugar gradually, while stirring.
- Drain most of the liquid, then turn the heat back to high and stir until consistency is more like a paste.
- Mix in salt, then turn off heat.
- Pour paste in a container, like a bread pan. Cover with plastic wrap or seal whole pan in a large ziplock bag.
- Keep in fridge until ready to use. Can be stored in the freezer for 2-3 weeks, but requires sufficient time to thaw (at least 30 minutes).