It is the confectionery made by melting Japan agar after adding water, and then boiling it down with sugar, and molding it after mixing with meringue (confectionery).
水を加えた寒天を火にかけて溶かし、砂糖を加えてしばらく煮詰めたものに、メレンゲ(菓子)をあわせて固めた菓子。