Woks can be made of iron, aluminum or brass. For our point of view, we like to use an iron wok and normally most of Thai popular restaurants in Thailand always use these too. However, they have to be burnt in a flame until they are red and turn to black color. Before using, they need to be seasoned by putting little oil into the surface and heating it with medium heat for a couple of minutes. Aluminum and brass woks also need to be seasoned with a little oil as above. The purpose of this oil seasoning process is to make the wok to be non-stick when cooking. Woks come in various sizes. The size you get should depend on the portion of food you normally will be cooking each time. Cooking Tip, if you cook small amount of food in a large wok will mean that the food will dry up easily and burn more readily. On the other hand, cooking a large amount of food in a small wok will also mean that the food will not be in contact with the heat evenly and will take longer to cook. Woks with wooden handles will enable you to hold it even when the wok is hot, but those with mental handles mean you have to use oven gloves or a kitchen towel.