You can easily make mustard vinegar miso yourself without buying it! It's delicious not only with sashimi konjac but also as a Japanese-style marinade sauce.
The story behind this recipe
I bought inexpensive sashimi konjac, but it didn't come with vinegar miso, so I made my own to suit my taste. It's tastier than store-bought! From now on, it's homemade for me!