Stir together all the ingredients in a small mixing bowl.
Do a taste test and adjust to suit the sauce according to your taste.
Allow it to sit for at least 15 minutes before serving to allow the flavors to meld.
Video
Notes
This gyoza sauce recipe is for a single serving. You can scale the recipe and make small individual dipping bowls so everyone can enjoy their own.You can replace soy sauce with tamari for a gluten-free version.Add more or fewer pepper flakes as per your heat tolerance. You can also use red chili powder, chili paste, chili oil, sriracha sauce, or sambal oelek instead of chili flakes.If the flavors are too strong, dilute the sauce with water.The key is to experiment and find the right balance of flavors that suit your tastes.