To make red bean paste, you need to wash and soak the red beans first. Generally, soaking overnight is good, about eight to ten hours. The volume of red beans will become larger after soaking, which is related to the variety and quality of red beans. Then add water according to the amount of soaked red beans. Generally, put red beans into a container (such as a small pot of ordinary water), check their relative amount, and then add twice as much water to the pressure cooker accordingly.