Will Frozen Mussels Open When Cooked?

Steam frozen mussels still in the shell for three or four minutes in a covered saucepan over medium-high heat with butter, garlic, and a tablespoon of extra virgin olive oil, then reduce the heat and simmer for a few minutes longer. The shells should open; discard any that remain closed.

Why do frozen mussels open when cooked?

If they are fresh and you trust the supply chain, open mussels before cooking probably just means they're still alive. Closed mussels after cooking could be that the muscle didn't relax or was pushed closed during cooking.

Can you cook with frozen mussels?

Cooking Frozen Mussels

If your frozen mussels are still in the shell, you can steam them in a pot filled with one inch of water, wine or broth for five to seven minutes or until the mussel shells have opened. You can also saute them in oil or butter over high heat. Discard any mussels that haven't opened.