Many suitable steamers are available. The most traditional is made of bamboo and consists of a circular frame with a woven-bamboo mesh base and a shallow-domed woven-bamboo cover. Bamboo steamers come in various sizes, but those measuring 12 to 13 inches in diameter nestle perfectly in the bowl of a standard-size wok. Foods rest on the mesh bottom and steam passes upward from the boiling water in the wok through the mesh into the food. These steamers can be stacked as many as three high, and different foods can be steamed simultaneously. This is my preferred steamer.