>Mount Koya (Koyasan) is located in the northeastern part of Wakayama and it has an 800m high valley amid the eight peaks of the mountain. It is a major pilgrimage site for followers of the Shingon sect of Buddhism that was founded by the monk Kukai. Recently this place has been getting popular with foreigners, especially French people because the travel guide Michelin ranked Koyasan with three stars.You can enjoy great natural scenery and the calm and holy mood that is far removed from the secular world. There are around 120 temples there and almost half the temples offer lodging for travelers (Shukubo) and serve Buddhist cuisine: Shojin Ryoji (vegetarian foods).
I found this food forum where people talk about combination of "soy sauce and butter." It's a very common flavor for Japanese people
The simplest way to try it is to put butter and soy sauce over rice or mix it with pasta. We have snacks like soy sauce and butter flavored potato chips, popcorn, etc. And in Japan, we also put soy sauce on corn, which is very delicious because the soy sauce makes the corn sweeter. Try it!