1/2cupdried bonito flakesor dried shiitake mushrooms for a vegetarian option
1/2cupsoy sauce
2tablespoonsmirin
3/4teaspoonsesame oil
3/4teaspoonrice vinegar
1/2cupyuzu juicefreshly squeezed if available
Instructions
Place the kombu and dried bonito flakes in a sterilized jar. Pour in the soy sauce, mirin, sesame oil, rice vinegar, and yuzu juice. Make sure the kombu and flakes are fully submerged. If they are not, cover the jar and give it a gentle shake.
Seal the jar and refrigerate for 24 hours. This steeping time lets the flavors meld and gives the sauce depth.
After 24 hours, strain out the kombu and bonito flakes. Return the clear sauce to the jar. Enjoy immediately or let the flavors develop further in the refrigerator for up to several months. Use as a dipping sauce or marinade.