1. Shelled oysters: 7-8 minutes; shellless oysters: 3 minutes; half-shell oysters: 5 minutes. Oysters contain protein, zinc, thiamine, calcium, magnesium, taurine, selenium, iron and other nutrients. They are relatively easy to cook. The cooking time should not be too long, otherwise the meat will become old and hard, and the nutritional value will be reduced. Put the cleaned and shelled oysters into the steamer, boil the water and steam for 5-8 minutes. If the shells are removed or the quantity is large, the time can be increased or decreased as appropriate.
2. After the oysters are heated, the muscle tissue degenerates and the oyster shells are loosened. Usually the oysters are fully mature in about 7 minutes. At this time, all the oysters that will open have already opened their mouths. If steamed for about 10 minutes Oysters that have not yet opened their mouths will generally not open their mouths, even if they are steamed for a long time.