noun
Kōshū miso; Yamanashi-style miso
A traditional miso from Yamanashi Prefecture, fermented with both rice and barley kōji, giving it a distinctive flavor.
甲州味噌は米麹と麦麹の両方を使うのが特徴です。
Kōshū miso is characterized by using both rice and barley kōji.
この味噌汁は甲州味噌で作りました。
I made this miso soup with Kōshū miso.
Shinshū miso is another regional miso from Nagano, typically made with rice kōji only, while Kōshū miso uses both rice and barley kōji.
甲州 (Kōshū, old province name for Yamanashi) + 味噌 (miso). The name simply refers to the regional style of miso from that area.