This blog is written by author Sachiko who is not a native speaker of English, so it may be hard to read. It is translated from the summary of Japanese page;

Making a sweet “Goma-Mochi”

I kneaded each black and white “Goma”, means sesame, into dough of “Mochi”, means rice cake, then rolled them and cut it.

It is a local sweet of Odate and the surrounding area.