===Ingredients===
  * 1 3/4 cups (500g) red or white miso
  * 1/3 cup (100ml) sake
  * 1/3 cup (100ml) mirin
  * 3 tablespoons (50g) sugar 

===Technique===
Put all ingredients into a saucepan, preferably nonstick, and heat slowly, stirring from time to time. When it has come to a boil, reduce heat to a minimum and cook, stirring from time to time, for 20 minutes. Cool and refrigerate for up to 1 month.


Tags: Japanese

Source: http://www.bento.com/trt-basics.html
Reprinted from the book:  The Food of Japan by Takayuki Kosaki and Walter Wagner