Grind black sesame seeds finely and set aside.
Soften the butter at room temperature.
Add powdered sugar and salt, then mix well.
Add ground black sesame and cake flour, and knead into a dough.
Wrap the dough in plastic wrap and let it rest in the refrigerator for 30 minutes.
Roll out the dough to your desired thickness and shape as you like.
Bake in a preheated oven at 180°C (356°F) for 15 minutes.