What is the purpose of applying salad oil to the wok?

Applying salad oil to the wok primarily serves to prevent food from sticking during the cooking process. When cooking in a wok, especially at high temperatures, an adequate amount of oil creates a non-stick surface that allows ingredients to maintain their texture and facilitates even cooking. This is particularly important in stir-frying, where rapid cooking and constant movement are critical to achieving the desired results.

The application of oil helps to form a protective barrier between the food and the hot surface of the wok. This not only ensures that the food can be easily stirred and tossed without sticking but also allows for better heat distribution, preventing burning and promoting even cooking. This technique is vital for achieving the signature flavors and textures associated with wok cooking.