Prawn dumplings (xia jiao)

Name: Prawn dumplings (xia jiao)
Prep time: 30 min
Cook time: 1 h 15 min
Total time: 1 h 15 min
Yield: 20 pieces
Ingredients: 100 g soy sauce; 25 g rice wine vinegar; 1 tbsp sesame oil; ½ - 1 tsp dried chilli flakes; 1 tsp toasted sesame seeds; 350 g water; 215 g wheat starch; 20 g potato starch; 90 g tapioca starch; 5 cm piece fresh ginger; 3 pieces dried shiitake mushrooms; 50 g spring onions/shallots; 4 sprigs fresh coriander; 170 g shrimp; 1 tbsp sesame oil; 1 tbsp sake; 1 tbsp soy sauce; 1 pinch ground white pepper; 1 carrot; oil; 600 g water