- 1 cup medium-aged light brown miso (shiro miso)
- 1/4 cup sake
- 3 tablespoon mirin
- 1/2 cup plus 1 tablespoon sugar
- 1/4 cup rice vinegar
- 2 tablespoon lemon juice
- 2 tablespoon grapefruit juice
- Place the miso, sake, mirin, and sugar in a medium-sized pot and stir until smooth. Cook the mixture over medium heat for 4-5 minutes, stirring with a whisk. Add the rice vinegar and the juices and cook until the miso sauce is no longer watery, about 8 minutes.
- Transfer the sauce to a clean, freezer-proof container. Cover the container with a tight-fitting lid and store it in the freezer for up to 3 months.