Guo You (過油) — Oil Blanching: The Professional Pre-Cook

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Guo you (過油, literally passing through oil) is the professional Chinese kitchen technique of pre-cooking protein or vegetables in a large quantity of oil at low-to-moderate temperature (110-150C) before the final stir-fry. The technique seals the surface of the ingredient rapidly, locks in moisture, sets the velveting coating, and allows the final wok cooking time to be reduced to seconds — enabling the characteristic speed and precision of Chinese restaurant cooking. Without guo you, a busy restaurant kitchen could not maintain quality across dozens of simultaneous orders.

Guo you is the invisible technique behind the distinctive texture and quality of Chinese restaurant cooking. Its absence in home cooking is the primary reason home stir-fries rarely match the restaurant experience.