Homemade Dashi Soy Sauce

In a small saucepan, bring the the sake, mirin, soy sauce, and bonito flakes to a low boil and then remove from heat.

Let mixture sit in a covered saucepan over night.

Strain the liquid through a sieve. Bottle and refrigerate.

The dashi soy sauce will keep in the fridge for up to 2 weeks.