Dumplings.
"Add cold water three times" is how Chinese cooks time boiled dumplings. It keeps the wrappers from bursting while the meat inside reaches safety.
Dumplings are found wherever wheat and meat meet: 饺子 and 馄饨, Japanese gyoza, Korean mandu, Nepali momo, Polish pierogi, Russian pelmeni, Italian ravioli. The construction is the same: a thin wrapper of cold-water or hot-water dough (XXVI.1), rolled with a thicker centre and thinner edges so the pleated top is not doughy; a filling of minced meat or vegetables seasoned, often with a little water or stock beaten in so it stays juicy, and with chopped vegetables salted and squeezed so they do not water the filling (III.8); sealed by pressing the edges together or pleating.
Cooking must get the centre of the filling to 71 °C for minced pork or beef, 74 °C for chicken (XVIII.2, XVIII.8), without bursting the wrapper. Boiled 水饺 go into a large pot of boiling water and are stirred gently; each time the water returns to a rolling boil, a cup of cold water is added (点水) — usually three times — so the wrappers cook through gently while heat reaches the filling. Steamed dumplings cook in 8–12 minutes over high steam. Pan-fried 锅贴 and 煎饺 are fried until the bottoms brown, steamed with a splash of water under a lid until the water is gone, then fried crisp again. The workshop cooks a filling.
Below: the minutes for the centre of a pork filling of the size you choose, from the fridge or from frozen, to reach 71 °C when boiled, steamed or pan-fried (thermal bench, wrapper not modelled), against the safe temperature for minced meat.
- Make and seal dumplings.
- Keep fillings juicy.
- Boil, steam and pan-fry dumplings.
- Cook the filling to a safe temperature.
Seal well, cook the centre, keep the skin whole
In this model a 22 mm pork filling boiled from the fridge reaches 71 °C at its centre in about 3.0 minutes once the water is boiling, steamed in about 2.8, and on a lidded pan, heated from one side, in about 7.1; a 30 mm filling needs about 5.4 minutes boiled, and a frozen 22 mm one about 4.2. The wrapper adds a little, and the 点水 method lengthens the boil gently, which is why boiled dumplings take 6–8 minutes from fresh and longer from frozen. Cut one open, or use a thermometer, the first time you cook a new size.
Method for 猪肉白菜水饺 (about 40): salt 300 g chopped napa cabbage, rest 15 minutes and squeeze hard; mix 400 g minced pork with 2 tbsp soy, 1 tbsp Shaoxing wine, ginger, white pepper and sesame oil, beat in 60 mL water or stock a spoonful at a time in one direction until springy, then fold in the cabbage and scallion. Make 冷水面 with 400 g flour and 200 g water, rest 30 minutes, roll 8 cm wrappers thicker at the centre. Fill, fold and pinch. Boil in a big pot, stirring once; each time it boils add a cup of cold water; after the third time and when they float and puff, lift out. Keep raw dumplings on a floured tray, and freeze spread out before bagging.
Boil a batch of dumplings with the 点水 method and check one with a thermometer at the end: is the centre above 71 °C?
Terms
- 点水
- Adding cold water each time boiling dumplings return to the boil.
- 锅贴
- Pan-fried dumplings: fried, steamed, fried.
- Pleating
- Folding the wrapper's edge into small pleats to seal it.
- 打水
- Beating water or stock into a meat filling to keep it juicy.
Sources
- USDA Food Safety and Inspection Service, "Safe Minimum Internal Temperature Chart" (foodsafety.gov), 2024.
- USDA FoodData Central, SR Legacy (April 2018), public domain.
- A teaching value chosen for the course: the right order of magnitude and shape, not a measurement of a particular food.