This amazingly easy and versatile recipe makes the most sweet, savory, and delicious eel sauce in only 20 minutes with 3 simple ingredients. (And no, it's not made with actual eels!)
Set a small sauce pot over medium heat. Measure and pour in the Mirin, soy sauce, and sugar. Stir to combine. Allow the mixture to come to a boil. Then reduce the heat to medium-low and simmer for 15 to 20 minutes, stirring occasionally.
The eel sauce is done when it has reduced by about half, and is thick enough to set up a little bit on a sushi roll. Remember, it will continue to thicken as it cools so remove it from the heat when it's just a bit runnier than desired.
Cool completely, then move the eel sauce to an airtight container and store it in the refrigerator for up to a month.
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Notes
Eel sauce will keep well for up to a month in the fridge. Let the sauce cool completely before transferring to an airtight container and refrigerating.