I'm going to show you how to make eel sauce now. Nice and thick and very sweet and salty at the same time. It's very good to drizzle on a roll.
Now I have mirin, one third cup. I have soy sauce, one third cup. And three tablespoons of sugar. Mix them up. Let it boil once and then turn the heat to low to simmer. Wait until 10 to 15 minutes. The thickness you are looking for is a honey texture. Once it gets cooled down, it gets thicker. Don't get too, too thick. Just turn the heat off once you get the honey texture. Once you cool that nicely, puff to the thickness you're looking for.
This is after 10 or 15 minutes. Nice and thick and bubbly. So now I'm going to pour it into a bowl. This is the finished product. Nice and thick. Once it gets cooled down, it gets much more thicker so you can drizzle on a roll.