Steep 20 g kombu in 1000 g water in a pot for at least 30 minutes.
Add 30 g sugar, 50 g sake, 3 g salt, 50 g rice vinegar, and 50 g koikuchi soy sauce to the kombu water.
Heat the kombu mixture slowly to 80°C, then remove the kombu.
Sesli anlatım, porsiyon ayarı ve daha fazlası