The Wok: Seasoning, Maintenance, and Heat Management

The wok's origins are in Han dynasty China — the large, high-sided, rounded-bottom iron pan that could be used over an open fire for all cooking methods: stir-frying, deep-frying, steaming (with a bamboo steamer set above), smoking, and braising. The carbon-steel wok used today is a direct descendant of this design, refined in material but not fundamentally altered in thousands of years.

The carbon-steel wok is the fundamental tool of Chinese cooking — not merely a frying pan but a cooking instrument whose specific properties (extreme thermal conductivity, the sloped sides that create multiple heat zones, the carbon-steel surface that develops a non-stick patina with use) produce results that cannot be replicated in any other vessel. Dunlop's treatment of the wok in *Every Grain of Rice* and *The Food of Sichuan* begins with the wok's seasoning — a process that must be correctly completed before the wok is first used, then maintained through correct cleaning and storage. A correctly seasoned wok is one of the most valuable pieces of kitchen equipment a cook owns.

The seasoned wok's surface produces wok hei ( reference) through the Maillard reactions between food and the hot carbon-steel surface — specifically through the presence of the polymerised oil layer on the wok's surface at high temperature, which contributes volatile aromatic compounds (aldehydes, ketones, and pyrazines) to the food in contact with it. Dunlop's insistence on carbon steel over non-stick surfaces is specifically about this flavour mechanism — the non-stick coating is chemically inert at frying temperatures and cannot produce these compounds.