Basic Stir-Fry Sauce (Oyster Sauce to Soy to Sugar)

2 parts

Oyster sauce (蠔油) — Lee Kum Kee Premium Oyster Sauce or equivalent; provides glutamates, natural sweetness, and viscosity. Vegetarian oyster sauce (mushroom-based) substitutes 1:1.

1 part

Light soy sauce (生抽) — Saltiness anchor; the oyster sauce alone is too sweet for most savoury dishes without it.

½ part

Sugar (white or rock) — Balances the brine of soy and the sweetness already in oyster sauce; prevents the sauce from tasting flat or harsh.

½ part

Shaoxing wine (optional) — Added to the wok separately just before the sauce, but often blended into the concentrate for simplicity.

a few drops, finishing

Sesame oil — Stirred in off-heat; its volatile aromatics evaporate instantly if added during wok cooking.

1 tsp cornstarch per 3 Tbsp sauce

Cornstarch slurry (1:2 starch to water) — Pre-mix into the concentrate (碗芡 method) or pour separately after the sauce is in the wok.

Combine oyster sauce, soy sauce, sugar, and optional Shaoxing wine in a small bowl. Stir until sugar is dissolved. Whisk in cornstarch last. Heat wok over maximum heat until a drop of water evaporates in under a second (the Leidenfrost point). Add oil and aromatics (garlic, ginger), then protein or vegetables in order of cooking time. When the protein is nearly done, pour the sauce concentrate around the edges of the wok so it hits the hot metal, sizzles, and reduces slightly before mixing with the ingredients. Toss vigorously for 30–45 seconds until the slurry thickens and the sauce clings. Finish with sesame oil off the heat.

• Pre-mixing the sauce (碗芡) before the wok heats is non-negotiable in professional Cantonese cooking; you do not have time to measure ingredients once the wok is at temperature.
• Pour the sauce around the rim of the wok, not directly over the ingredients — the hot metal surface caramelises the sugars instantly before they mix in, adding depth a direct pour cannot achieve.
• The slurry percentage controls coating density: 1 tsp cornstarch per 3 Tbsp sauce gives a light coating; 2 tsp gives a thicker, restaurant-grade glaze.
• Taste the sauce concentrate before the wok is hot; it should be noticeably sweet-salty-umami and slightly over-seasoned, because it will dilute when it hits the wet ingredients.
• Sesame oil goes on last, off heat — it is a finishing oil, not a cooking oil; its smoke point is too low and its flavour too delicate to survive the wok's heat.

• Ginger-scallion variation

  Add 1 Tbsp minced ginger and 2 Tbsp sliced scallion to the concentrate; base ratio unchanged.

• Chili-garlic version

  Add 1 tsp sambal oelek or chili crisp; reduce sugar to ¼ part to compensate for the chili paste's sweetness.

• Cantonese beef (干炒牛河 sauce component)

  Add dark soy (½ part) and fish sauce (few drops) for the sauce on flat rice noodles; more complex than the basic ratio.

• Black bean stir-fry sauce

  Add 1 Tbsp fermented black beans (douchi), rinsed and mashed, to the concentrate; reduce soy by half since black beans are salty.

• Minimal home version (no pre-mix)

  Oyster sauce straight from bottle into wok, finished with a splash of soy and a pinch of sugar; works but the sauce ratio is harder to control in the wok's heat.

• Mapo Tofu Sauce (Doubanjiang to Stock to Tofu)

  A related Sichuan wok sauce; the two-addition slurry technique is the same.

• Sweet-and-Sour Sauce (Vinegar to Sugar to Soy to Ketchup)

  A more complex Chinese sauce using the same stir-fry slurry method.

• Teriyaki Glaze (Soy to Mirin to Sake)

  The Japanese analogue: soy-based, sweetened, glossy glaze applied at high heat.

1. 1.The Wok: Recipes and Techniques — J. Kenji López-Alt
2. 2.Every Grain of Rice — Fuchsia Dunlop
3. 3.The Complete Chinese Cookbook — Ken Hom
4. 4.Chinese Cooking for Diamond Thieves — Dave Lowry

Confidence: high