Originally Posted by BenLothair
Thank you. And as a follow up: if the Salmon was frozen before I got it, then I thawed and then cooked it in a pie, am I right that I therefore cannot freeze the cooked pie - because if I thaw it again then that will mean the salmon will have been frozen and thawed twice? Or is there any difference because it was raw the first time and cooked the second time?
No - to the part about not being able to freeze and reheat the cooked pie.
This is similar to using tinned salmon (packed raw into the can and cooked in the can during processing) to make salmon patties (mixed with other ingredients and fried) and then freezing them so you can reheat and serve them at a later date.
What you have described is similar to this - you cooked the salmon (like in the canning process) and then made the pie from the cooked salmon (like making the salmon patties) an then froze it/them (like freezing the cooked salmon patties). If you thaw and reheat, or reheat from frozen, it should be just fine.