A microwave steamer cooks food in the microwave using the same heating method as a hob steamer basket. These plastic containers heat water in the dish, generating steam, which quickly cooks the food inside. A vent on the lid prevents the steam from blowing the lid from the container. Microwave steamer bags use the same principle, but have venting holes in the sides of the bag. Cooking times for the bags and plastic containers are similar. A microwave steamer or steamer bag is an ideal option for those in dorms or apartments or anyone who does not want to heat up the kitchen with a stove.
Pour 2 tbsp water into the bottom of a plastic steamer. Skip this step if using steamer bags.
Arrange the food on the included rack or on the sides of the steamer so it does not touch the water, or fill the steamer bag with the food.
Cover the steamer with the lid and open the vent cap on top.
Microwave the food on high power until vegetables become crisp-tender or fish becomes flaky: between five to 15 minutes for vegetables and three minutes for fish. Consult a microwave steamer cooking chart for more specific times based on your microwave's wattage and the food you're cooking. Cooking times for plastic container microwave steamers and bag steamers will be the same.
Leave the food in the microwave to allow residual heat to finish cooking the food for three minutes. Do not remove the lid.
Carefully open the container to avoid escaping steam, and serve immediately.