This is a recipe for "Mizu Yokan" (water yokan) that can be easily made with just three ingredients, without using a stove, and only requires a microwave and a refrigerator. First, soak the powdered gelatin in water, then heat the water in a separate heat-resistant container in the microwave to dissolve the gelatin. Add the sweetened red bean paste (either chunky or smooth) and mix well, then transfer to a container and chill in the refrigerator for 2 hours until set. Enjoy this refreshing and delicious Japanese sweet that's perfect for summer.