Combine ingredients in a large saucepan over high heat. The larger the pan, the faster it will reduce. For me it takes about 10 minutes, but it depends on the size of the pan you use.
Bring to boil, then turn heat down and simmer until it reduces by half. The consistency should be like a light syrup.
Bring to room temperature before using.
Homemade Teriyaki Sauce · Dinner Match Lab | Dinner Match Lab