In a small bowl, combine soy sauce, rice vinegar, toasted sesame oil, brown sugar, chili flakes, minced garlic, ginger powder, cornstarch, and water well until there are no lumps.
Pour the mixture into the pan and bring the mixture to a boil by constantly whisking over low and simmer flame until the sauce thickens and reaches the desired consistency.
Remove the sauce from the heat and allow to cool before storing.
