Chinese potsticker dumplings

Name: Chinese potsticker dumplings
Prep time: 2 h
Cook time: 30 min
Total time: 2 h 30 min
Cuisine: Chinese
Ingredients: 140g/5oz plain flour, plus extra for dusting; 125ml/4fl oz very hot water; 110g/4oz pork mince; 75g/3oz Chinese cabbage or spinach, finely chopped; 1 tsp finely chopped ginger; ½ tbsp Shaoxing rice wine (or dry sherry if none is available); ½ tbsp dark soy sauce; ½ tsp light soy sauce; ½ tsp salt; ¼tsp freshly ground black pepper; 1½ tbsp finely chopped spring onions; 1 tsp sesame oil; ½ tsp sugar; 1 tbsp cold chicken stock or water; about 1 tbsp groundnut oil; 75ml/3fl oz water; 3 tbsp soy sauce; 1 tbsp white rice vinegar; 2 tsp chilli oil