In a pan, put some black sesame seeds in and turn the heat to medium
roast until the sesame seeds are warm and you can smell the sesame. Take it off the heat and cool
Use a blender or spice grinder and grind the black sesame seeds. It doesn’t have to be too fine
In a bowl, add in grounded black sesame seeds, sugar, butter together
Roll them into balls (roughly 10g) and set them onto a tray lined with parchment paper.
For the red bean paste, roll them into balls and also set them onto a baking tray
Freeze the filling for about 30 minutes.