Beef Gyoza with Spicy Dipping Sauce

Name: Beef Gyoza with Spicy Dipping Sauce
Prep time: 30 min
Cook time: 10 min
Total time: 40 min
Cuisine: Chinese, Japanese
Ingredients: 200 g ground beef (choose a cut with decent fat content); 100 g onion (or napa cabbage, finely diced); 1 tsp grated ginger root (or ginger paste); 200 g green cabbage (finely diced); 30 g garlic chive(s) (finely chopped); 3 cloves grated garlic (or garlic paste); 1 pinch salt and pepper; 1 tbsp oyster sauce; 1 tbsp red wine (or dry sherry, sake, or Shaoxing wine); 1 tsp smooth Dijon mustard (smooth type); ½ tsp ground cumin; ½ tsp coriander powder; ⅛ tsp cinnamon powder; ⅛ tsp nutmeg powder; 40 gyoza wrappers (8.5cm+ recommended for easier folding); 1 tbsp cooking oil (neutral, high smoke point); 150 ml freshly boiled water; 1 tsp Chinese-style chicken bouillon powder (based on 1 tsp = 200ml soup ratio, scale to your brand's strength); 2 tbsp Japanese soy sauce (koikuchi shoyu); 1 tbsp rice vinegar; ½ tbsp toasted sesame oil; ½ tbsp chili bean sauce (toban djan) (or gochujang, or sambal oelek); ½ tsp chili oil (rayu) (optional); ½ tsp sugar; 1 tsp grated ginger root; 1 tbsp finely chopped green onions; dried red chili pepper (thinly sliced)