Shiruko

Rinse 200 g azuki beans and soak them in water for at least 4 hours or overnight.

Drain the soaked azuki beans and place them in a pot with 1500 g water. Bring to a boil, then reduce heat and simmer for 1.5-2 hours until tender.

Drain the cooked beans, reserving the cooking liquid. Return the beans to the pot with the reserved liquid and 150 g sugar. Simmer gently for 10 minutes.