Step 1

Gather all the ingredients.

Step 2

In a small saucepan, add mirin, sake, sugar. Turn on the heat to medium heat and whisk all the mixture.

Step 3

Then add soy sauce and bring it to a boil. Once boiling, reduce heat to the low heat and continue simmering for 10 minutes. Toward the end of cooking, you will see more bubbles.

Step 4

Turn off the heat and let cool. The sauce will thicken more as it cools. You can store the sauce in an airtight jar and keep in the refrigerator for up to 2-3 months.