Beef dumplings in hot & sour soup (酸汤水饺)

For the dough

• 300 g all-purpose flour plus extra for dusting
• 1 pinch salt
• 160 ml water see note 1

For the filling

• 300 g minced beef see note 2
• 1 stalk scallions finely chopped
• 1 teaspoon minced ginger
• ½ teaspoon ground Sichuan pepper or Chinese five-spice powder
• 1 teaspoon Shaoxing rice wine
• 1.5 teaspoon salt
• 150 ml water or stock
• 150 g Chinese chives finely chopped
• 1 teaspoon sesame oil

For the spiced vinegar

• 80 ml black rice vinegar
• 80 ml water
• 2 teaspoon brown sugar or regular sugar
• 1 piece Chinese cinnamon(cassia cinnamon)
• 1 star-anise
• 1 bay leaf
• 1 pinch fennel seeds
• 1 pinch Sichuan peppercorn

For EACH bowl of soup

• 1 teaspoon light soy sauce
• ½ teaspoon sesame oil
• 1 tablespoon Chinese chilli oil or to taste
• 1 pinch salt
• spring onion chopped
• Coriander chopped
• toasted sesame seeds
• papery dried shrimp Optional