When I was a child, I ate a cake with a black spot in the middle called snowballing usury. The snowballing is glutinous rice paste and a big bowl of soybean powder. The glutinous rice paste is kneaded into balls and put into the soybean powder. In the past, what you ate was a clean Ciba, and the bean paste was added in the middle of the Ciba. From the outside, it looks like there is a black spot in the middle of the Ciba. Ciba is a kind of food made by steaming and mashing glutinous rice. It is made by putting cooked glutinous rice in a stone trough and mashing it with a stone hammer or reed. This kind of food can be called Ciba.