Steaming is a method of cooking involving water steam that helps to preserve the nutrients in the food during the cooking process. For steaming it's important to use a pan with a lid that closes tightly to keep the heat in. The pan also has a sieve insert, because the food has to be prevented from coming into contact with the liquid. Steaming is ideal for foods that contain a lot of water such as vegetables. Steam cooking makes delicious and nutritious broccoli, cauliflower and zucchini. Fish and poultry can also be steam cooked to produce wonderfully tender results.