Grind the black sesame seeds finely and set aside.
Mix glutinous rice flour, sugar, and salt in a bowl.
Add water and knead until well combined.
Add the ground black sesame and mix again.
Break off bite-sized pieces of the dough and drop them into boiling water.
When the rice cakes float to the surface, remove them and rinse in cold water.
Drain well and arrange on a plate to serve.