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.
Beside above, how do you cook frozen mussels in a bag? Place unopened pouch into boiling water, boil for 7 minutes or until mussels are hot. Microwave - From Frozen - Remove a vacuum-sealed pouch with outher bag. Puncture holes in pouch with a fork before placing into the microwave. Cook on highest temperature setting for 4 to 6 minutes - or until mussels are hot.
Also to know is, do frozen mussels open when cooked?
With frozen ones, you can be reasonably sure they were frozen while still fresh and alive, and you dont need to worry about opening them after cooking, because its not the living mussel trying to survive that causes them to open.
How do you defrost mussels?
Allow the frozen mussels to thaw overnight in the refrigerator in a container with a sealed lid. Run warm water over a container of frozen mussels if time is of the essence, however gently thawing them out in the refrigerator yields more tender results.