I think this comes pretty close. < Maithx > 01/29 13:19:34

3/4 cup red miso
3 tablespoons sugar
3 tablespoons mirin
2 tablespoons water, hot
2 teaspoons light soy sauce
1/4 teaspoon sesame oil 1 tablespoon toasted sesame seeds

Combine the miso and sugar first, then whisk in the other ingredients