In a bowl, combine all the ingredients for the gyoza filling.
Layout gyoza wrappers. Add a teaspoon of filling in the center of each wrapper. Dip finger in water and run it around the edge of the gyoza wrapper. Fold the wrapper over and seal securely.
Heat 1 tbsp oil in a large skillet. Once the oil is hot. Add gyozas. Cook for about 2 minutes. Flip gyozas and add 1/3 cup water and close skillet with a lid (add 1 tsp oil mixed with water if you like the taste of sesame oil). Cook for 2-3 minutes. Repeat with remaining batches.
In a skillet, combine and heat all ingredients for the gyoza sauce. Bring to a low boil then remove from heat. Serve warm or cold.
TIP: To enjoy frozen gyozas, defrost gyozas and add an additional 1-2 minutes to cooking time.