Instructions

1. 1
   Generously dust a cookie sheet with cornstarch.
2. 2
   Combine the sugar, soy sauce, and water in a saucepan. Simmer until the sugar fully dissolves, stirring so as not to burn.
3. 3
   Add the rice flour, and stir well to form a cohesive dough.
4. 4
   Transfer the dough to a microwave-safe container. Heat it in the microwave for 30–40 seconds, then take it out and mix well. Repeat this process until it is thoroughly brown.
5. 5
   Mix the walnuts into the dough.
6. 6
   Pat the dough evenly onto the prepared cookie sheet in a layer about 5 cm (2 in) thick. If it's too hot, let it cool a bit first.
7. 7
   Dust the top of the dough with additional starch. Let cool fully.
8. 8
   Cut the confection into pieces.