Put grape molasses and 3 glasses of water on the stove and bring it to a boil. Mix the starch thoroughly with 1 glass of water. Add starchy water and sugar to the boiling grape molasses mixture. Simmer for 1-2 minutes and turn off the heat. Thread the walnuts onto the quilt thread with the help of a needle, then dip them into the must a few times and remove them. Then hang it in a suitable place, dry it for at least 2 days and serve.