How to make bean paste?

Ingredients
1 cup dried red beans
4 cups water, divided, or as needed
1 1/2 cups white sugar
Add all ingredients to list Directions
Place beans in a saucepan and cover with 2 cups water; bring to a boil and cook for 5 minutes. Drain and discard water.
Place drained beans in a clean saucepan and cover with 2 to 3 cups water. Bring to a boil, reduce heat to low, cover the saucepan, and simmer, adding more water as needed, until beans are soft and can be crushed between your fingers, 1 1/2 to 2 hours. Drain beans and discard water.
Stir beans and sugar together in a saucepan over medium-high heat. Cook, stirring constantly, until sugar melts and beans form a loose, shiny paste, about 10 minutes. Immediately transfer the paste to a container to cool. Store, covered, in the refrigerator.

Demo Video