| 120.0 gram | Sake |
| 180.0 gram | Mirin |
| 140.0 gram | Sugar |
| 280.0 gram | Miso, white (shiro) |
Combine miso and sugar in the top of a double boiler. Add sake and mirin, and whisk to combine, using a heavy whisk.
Cook over boiling water, stirring frequently until sugar is dissolved and the color begins to darken, 30 to 45 minutes. Remove from heat, and cool.