Use a heavy wok for simmering as
it allows even heating over a long
period of time.

Equipment For Simmering

• Choose a heavy wok or large skillet with a tight-fitting lid. The thick base of a heavy wok or skillet allows even heating over a long period of time.
• If you are using a steel wok, be sure the wok and the lid are well-seasoned. If the steel is not treated, tomatoes, lemon juice, wine, vinegar, and other acidic ingredients may react with the steel and cause discoloration of the food and the wok. Although the discoloration doesn't affect the taste or safety of the food, it usually looks unappetizing.
• When a lid is needed, make sure it is tight-fitting so moisture and steam do not escape from the wok or skillet.