On my way back to city area from mountains and found this Japanese restaurant, おぎのや 群馬の台所; which is located within JR Station at Takasaki that served authentic local dishes.

Kamameshi with Boiled Konjac or they call it 峠の釜めしこんにゃく味噌田楽セット, presented in ekiben. Ekiben is similar to the familiar bento set, which consists of rice with various vegetable ingredients.

The set I ordered also comes with boiled konjac, which the texture much like rubbery and flavorless zero-calorie high-fiber food made of yams.