Gyoza Dumplings with Black Vinegar Dipping Sauce

Ingredients

• 4 tbsp soy sauce
• 2 tbsp mirin
• 2 tsp toasted sesame oil
• 3½ tbsp rice vinegar
• 1 scallion (green onion), finely chopped
• ½ bunch of fresh chives, finely chopped
• 1 red chili, deseeded and finely chopped
• 4 tbsp vegetable oil
• 1 onion, chopped
• 1 garlic clove, crushed
• ½ oz fresh ginger, peeled and finely chopped
• 2 carrots, grated
• 1 bunch of spring onions (scallions), finely chopped
• 3 wood ear mushrooms (or any mushroom of your choice), finely sliced
• 350g/12oz fresh firm tofu
• 1 tbsp soy sauce
• 1 tbsp toasted sesame oil
• 12oz pack dumpling skins