Finely chop 100 g boneless chicken thigh until it's small and chunky with more texture than ground chicken.
Place it in a large mixing bowl along with 100 g ground chicken, 50 g onion, 20 perilla leaves (shiso), 3 pickled plums (umeboshi), 50 g green cabbage, 30 g garlic chive(s), 1 tbsp sake, 1 tsp Japanese soy sauce (koikuchi shoyu), ½ tsp salt, 1 pinch ground black pepper, 1 tsp grated ginger root and 1 tbsp toasted white sesame seeds.
Mix until everything is evenly distributed.
Take a gyoza wrapper and add about 1 tbsp of the filling to the center, leaving a finger-width border around the edge. Rub a small amount of water around the edge.
Fold the wrapper in half without letting the sides touch, then pinch one corner and start pleating.
Fold and press to make the pleats until the gyoza is closed.
Press the edges down firmly to tightly seal.
Place on a flour dusted plate and repeat until all of the gyoza wrappers and filling are used up.
Heat a frying pan on medium and add 1 tbsp cooking oil. Once hot, place the gyoza in the pan with the flat side facing down and fry until the bottoms are crispy and brown (approx 2-3 minutes). Check frequently to prevent burning.
Pour 125 ml freshly boiled water around the pan. (Be careful of oil splashing.) If cooking the gyoza in smaller batches, reduce the water accordingly.
Place a lid on top and cook until the liquid is almost gone and the tops of the gyoza are soft and supple.
Remove the lid and continue to cook until the liquid is completely gone. Drizzle with toasted sesame oil and cook for 30-60 seconds before removing the pan from the heat.
Serve with ponzu sauce and enjoy!
Notes
Use all ground chicken if you can't get chicken thighs.Prep all vegetables, herbs, and seasonings before starting to keep the process smooth and stress-free.Keep oil at a steady shimmer. If it starts to smoke, lift the pan off heat for 30 seconds to prevent burning.
Adjust the amount of boiling water and cooking oil based on how many gyoza you cook at once. Use less for smaller batches.
Store cooked gyoza in an airtight container for up to 3-4 days. Raw filling lasts 1-2 days refrigerated. Freeze uncooked dumplings flat on a tray, then bag airtight; cook directly from frozen for best results.Mix and refrigerate the filling up to a day ahead or freeze freshly pleated dumplings right away for meal prep.Reheat chilled gyoza in a skillet with a little oil and water to re-crisp the bottoms without drying them out.Serving ideas: Steamed white rice (gohan), Miso soup with tofu and wakame, Wakame seaweed salad, Japanese sesame spinach (goma-ae)