Rinse the red beans thoroughly and soak them in water for at least 6 hours.
Put the soaked red beans in a pot with plenty of water and boil until cooked.
Drain the boiled red beans using a sieve to remove excess water.
Grind the drained red beans smoothly in a blender.
Transfer the ground beans to a pot and add low-sugar sugar and salt.
Cook over medium to low heat, stirring constantly, until the paste reaches the desired consistency.
Let it cool slightly and transfer to a container.