Inclined to agree with Naz and Pickle. But this got me wondering, 'cos you can buy frozen pre-cooked mussels. They're probably frozen from hot, I guess. Anyone know?
When you have cooked mussels if the shells are closed then they should not be eaten and if the sahells are open then they are good to eat. If it was just reheating mussels that have come out of open shells then I think that would be ok