Add 1 tbsp rice vinegar, 2 tsp Japanese soy sauce (koikuchi shoyu), ½ tsp chili oil (rayu) and ⅛ tsp ground black pepper to a small bowl and mix until combined.
This recipe is enough for two people so either share from one dish, or divide it into two separate smaller dipping plates. (Enough for about 16 gyoza, 8 each)
Store fresh, unused gyoza dipping sauce in the fridge for up to one week.
Keeping used leftover sauce is not recommended.
You can customize your sauce with dry chili flakes, fresh chili, grated ginger, grated garlic, lemon juice, sliced green onion, or sesame seeds.
Adjust ingredient quantities to suit your personal taste preferences.