This thick and sweet homemade teriyaki sauce recipe is quick, foolproof, and so, so good.
In a medium saucepan, over medium-high heat, combine all ingredients. Bring to a simmer, watching closely to make sure sauce does not begin to boil over.
Once at a simmer, turn heat down to medium to keep it there. Simmer for 5 to 10 minutes, stirring occasionally, until thickened. (Sauce will thicken further as it cools.)
Cool sauce slightly before using and enjoy.
Store leftover teriyaki sauce in the refrigerator in an air-tight container.