Details: Here are some search results I found: https://www.amazon.com/Biscuit-Combination-Biscuits-%E9%BB%91%E7%B3%96%E5%92%B8%E8%9B%8B%E9%BB%84%E9%BA%A6%E8%8A%BD%E5%A4%B9%E5%BF%83%E9%A5%BC%E5%B9%B2%E7%BB%84%E5%90%88%E8%A3%85%E4%BC%91%E9%97%B2%E9%9B%B6%E9%A3%9F%E7%BA%A2%E7%B3%96%E9%A5%BC%E5%B9%B2%EF%BC%88%E5%92%B8%E8%9B%8B%E9%BB%84106g-%E9%BB%91%E7%B3%96106g%EF%BC%89/dp/B07RQ3QFR3
Supposedly, there’s salted egg yolk in this, but I didn’t taste any. I did some searches online and it seems like may be supposed to eat these with salted egg yolk? I’m not sure. In any case, it’s biscuit where to crackers sandwich some type of filling. I don’t know what the filling is, but it has negligible taste.
In the end, it’s pretty much just plain biscuits with a flavorless filling sandwiched in between.