Stir-frying (炒, chǎo) is the defining high-heat cooking technique of Chinese and Southeast Asian cuisines. Ingredients are cooked rapidly in a very small amount of oil over intense heat, with constant tossing and stirring to ensure even contact with the wok surface.
The physics of stir-frying
Two effects define stir-frying: the Maillard reaction and wok hei. The Maillard reaction produces the savoury browned crust on meat and vegetables at temperatures above 150 °C (300 °F). Wok hei (“breath of the wok”) is the smoky, lightly charred flavour unique to very high heat cooking — only achievable in practice on a commercial or high-BTU burner, or with a well-seasoned carbon steel wok run at full domestic heat with an uncrowded pan.
Home cooks can approximate wok hei by cooking in small batches, using a dry and very hot wok, and not covering it.
Equipment
A carbon steel wok (round-bottomed or flat-bottomed for induction/electric hobs) is the canonical vessel. Its sloped sides allow ingredients to be tossed up and out of the main heat zone. Carbon steel conducts heat rapidly and, once seasoned, provides natural non-stick properties. A wok spatula (wok chuan) with its angled edge is designed to match the wok’s curve.
High-BTU burners (≥15,000 BTU) replicate the open-flame intensity of restaurant woks. Domestic gas hobs typically deliver 8,000–12,000 BTU — sufficient for small batches but not for restaurant volume.
Sequence
- Heat wok until smoking hot — a bead of water should vaporise immediately.
- Add oil (high smoke-point: peanut, rice bran, grapeseed) and swirl to coat.
- Aromatics first — garlic, ginger, dried chilli bloom in 15–30 seconds.
- Protein — spread flat, leave untouched for 30–60 seconds to sear; then toss.
- Vegetables — harder vegetables first, leafy greens last.
- Sauce — add around the edge of the wok to vaporise alcohol and concentrate.
- Finish — sesame oil, cornstarch slurry, or final toss over high flame.
Common variants
| Variant | Distinction |
|---|---|
| Dry stir-fry (gān chǎo) | No sauce; achieves maximum caramelisation; used for green beans and dry-style beef |
| Sauce stir-fry (huì chǎo) | Wet sauce thickened with cornstarch; produces a glossy coat on ingredients |
| Smooth stir-fry (huá chǎo) | Protein is velveted first (marinated in cornstarch + egg white) for a silky texture |
| Flash stir-fry (bào chǎo) | Very high heat, very short time — seconds — for delicate seafood and leafy greens |