What is the first action to take when a wok catches on fire?

Turning off the heat source is the most effective first action to take when a wok catches on fire because it stops the cooking process and eliminates the fuel that is feeding the flames. By removing the heat, you significantly reduce the intensity of the fire, which is critical in managing a kitchen fire.

Attempting to pour water on the fire, especially in a grease or oil fire situation, can lead to a dangerous flare-up, as water can react violently with hot oil. Calling the fire department or using a fire extinguisher may also be appropriate actions, but they should typically come after attempting to control the fire by turning off the heat source first, as quicker action can often prevent further escalation. Therefore, shutting off the heat source is a vital step in effectively managing the situation when a wok ignites.