Oysters with shells for 5-7 minutes. Because the shell of oyster with shell is hard and the gap is small, it can't contact with water vapor well, so the steaming time needs to be a little longer, and it usually needs to be steamed for 5-7 minutes after the water is boiled. If the size of oyster is relatively large, the steaming time can be extended to 10 minute.

Shelled oysters for about 3 minutes. Shelled oysters can be directly contacted with water vapor because there is no hard shell to stop them, and the ripening speed will be faster, and protein is prone to denaturation. Generally, it can be steamed for about 3 minutes after boiling.

Extended data:

How to clean live oysters?

1, soak the oysters in water and drop some sesame oil. After about two to three hours, you can see a lot of dirty things in the basin bottom.

2. Then put a proper amount of edible salt in the water and soak the oysters 15 minutes, which is convenient for cleaning the impurities in the shell.

3. Put on plastic gloves with both hands and prepare a small brush to start scrubbing the shell of oysters.

4, after cleaning, you can steam, boil, bake and other cooking and eating.

References:

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