Step 1

In a saucepan, set over medium heat, whisk together the soy sauce, water, mirin, brown sugar, kosher salt, garlic, and ginger. When the mixture reaches a simmer, bring the heat down to low and allow to reduce for 10 minutes. Transfer to a small bowl; the mixture will thicken as it cools.

Step 2

Note: If you want super thick teriyaki sauce, you can use a bit of cornstarch to help. Here's how: pour a tablespoon of the sauce into a small bowl. Add a teaspoon of cornstarch to the small bowl and whisk until it completely dissolves. Add the cornstarch mixture to the teriyaki sauce, whisking until dissolved.

Step 3

This teriyaki sauce will give you about 1 cup of teriyaki sauce. This sauce keeps well in the fridge in an airtight container for up to two weeks.