Koganei Imo, a type of bean cake which is the product of a shop with 5 generations of expertise behind it. It's by far my favorite bean cake in Japan.
Shinise (老舗) are long-established restaurants or shops in Japan that usually have generations of expertise behind them. Such shops often present unique fare that can't be had anywhere else. They have developed a technique, formula or recipe which can only be experienced via their particular business. The sense that tradition for the product or service goes back in Japanese history is strong, and gives you a real feel of "old Japan" even when you're standing in the modern world.
I'll miss shinise, and the experience that patronizing such establishments brings.