Yokan, one of Japanese sweets
This shop, Toraya, sells yokan. Yokan is a kind of Japanese sweets and comes from China. This is made of agar-agar, kanten in Japanese, sugar and some ingredients. The texture is a little harder than that of pudding and jelly. The taste is, roughly speaking, almost as sweet as that of chocolate cake. The sweet go well with Japanese green tea since this is rather sweet and green tea is bitter. Perhaps this sweet also may go well with extra sec sparking wine.
By the way, one of Japanese customs is Oseibo, sending presents to elder people in December. This yokan is popular items as a present.