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- 1 cup Japanese shoyu soy sauce
- 1/2 cup dark brown sugar
- 1 cup mirin
- 1/2 cup Sake
- Mix soy sauce, sugar, mirin, and sake together in a small saucepan.
- Bring mixture to a boil over medium-high heat, reduce to a simmer, and cook until thickened enough to coat a spoon, about 20 minutes.
- Remove from heat, let cool, and use immediately or store in an airtight container in the refrigerator.