Universal Chinese culinary technique
Gou qian (勾芡) — the Chinese art of starch thickening — transforms cooking liquid into a glossy, clingy sauce that coats ingredients uniformly. Unlike Western roux or cream reductions, Chinese starch slurry is added at the last moment to a nearly-finished dish, creating instant glossy sauce. Technique critical for hot and sour soup, mapo tofu, and all braised dishes.
Technique is flavour-neutral but concentrates existing aromatics and distributes them evenly across ingredients
{"Cornstarch slurry: 1 part starch to 2 parts cold water","Add slurry to simmering (not boiling) liquid while stirring constantly","Starch gelatinises at 95°C; sauce thickens within 30 seconds","Judge by 'napper' consistency: coats back of spoon, slow drip","Three thicknesses: thin (soups), medium (stir-fries), thick (braised)","Potato starch produces clearer, more delicate gel than cornstarch"}
{"For crystal-clear sauces use potato starch (Cantonese preference)","Add a few drops of hot oil just before serving for extra gloss","In cold dishes use a tiny amount of gou qian on room-temperature dressing to give 'body'"}
{"Adding cold slurry to cold liquid — starch won't activate","Over-thickening produces gluey, unpleasant texture","Re-heating breaks down starch — serve immediately after thickening"}
Land of Fish and Rice — Fuchsia Dunlop