In a mixing bowl, add flour, salt and water. Knead with your hands (or a stand mixer with a fitted dough hook) to form a medium-firm dough (See note 1).
Leave to rest for 30-60 minutes. Then knead again until smooth.
Mix the filling
Mix beef, spring onion, ginger, ground Sichuan pepper (or five-spice powder), rice wine and salt.
Swirl constantly in the same direction while gradually adding water/stock into the mixture until all the liquid is completely absorbed.
Add Chinese chive and sesame oil then mix well.
Prepare the spiced vinegar
Simmer all the ingredients for the spiced vinegar for 5 mins (cover with a lid) then drain through a sieve. Discard the spices. Set aside.
Roll the wrappers
Make a loop with the dough (about 2.5 cm / 1 inch in diameter). Cut it into about 40 equal sections.
Press each piece into a small disc with the palm of your hand.
Use a rolling pin to flatten it into a thin disc (please refer to the video). Always remember to dust with flour if the dough sticks.
Shape the dumplings
Place a spoonful of filling in the middle of a wrapper. Fold the wrapper, then seal it. You may do it any way you like as long as you make sure there is no leakage (See note 3).
Cook the dumplings
Bring a large pot of water to a boil over a high heat. Gently slide in half of the dumplings (see note 3). Cover with a lid.
When the water returns to a boil, pour in about 120 ml of cold water then cover. Repeat the same procedure another two times (see note 4).
Assemble the bowl
While waiting for the dumplings to cook, prepare the serving bowls. Pour 1-2 tablespoons of spiced vinegar into each bowl. Add all the remaining ingredients. Spoon in cooked dumplings along with some water from the pot.
How to freeze dumplings
Freeze raw dumplings right after they are assembled. Lay them on a tray (dust with flour or line with parchment paper). When totally frozen, transfer them into an air-tight bag.
No need to defrost before cooking. Follow the same cooking procedure described above.
Notes
1. The ideal flour water ratio may vary slightly depending on the brand of the flour and how you measure it (Measuring flour with cups is less accurate). To make wrapper rolling easier, the dough shouldn’t be too soft.2. For better taste, choose minced beef which has a higher fat content.3. Please refer to my post on "Ten ways to fold dumplings" which includes a turorial video. 4. It is advisable to cook dumplings in batches (20-25 dumplings at a time) to avoid them sticking to the bottom of the pot.