Mix Ingredients: In a small saucepan, combine warabi starch, sugar, and water. Stir until the starch is completely dissolved.
Cook Mochi: Place the pan over medium heat. Stir constantly until the mixture thickens and turns translucent. This takes about 5–7 minutes.
Transfer to Tray: Pour the cooked mochi into a lightly oiled tray or container. Smooth it out evenly. Let it cool for 15–20 minutes or chill for a firmer texture.
Cut Mochi: Once cooled, cut the mochi into bite-sized cubes using a sharp knife.
Add Toppings: Dust the cubes generously with kinako. Drizzle brown sugar syrup on top. Optionally, serve with sweet red bean paste or Okinawan sweet potato cubes.
Serve: Enjoy chilled for a refreshing treat or room temperature if preferred.