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No Unopened tinned food keeps indefintely.
Yes, you can freeze a cooked beef joint.
Yes, you can safely freeze ham after it has been cooked. After thawing the same frozen cooked ham, it is unsafe to freeze it again.
Yes, you can safely freeze cooked fish.
I would not advise it!
yes if you put it in the freezer
If you've been keeping it in the refrigerator for four days, I wouldn't, no. Anything cooked that you wish to freeze for later use should be frozen that day.
An example is tinned salmon. The salmon is steam cooked while in the tin, and can be eaten straight from the tin - any bones (usually parts of the spine) have been cooked and soft.
Cooked sweet corn has significant antioxidant activity, which has been suggested to reduce the chance of heart disease and cancer-although this has not been definitively proven in practice
No you should never refreeze any uncooked food. You can cook the bacon and then freeze it.
Yes, if it wasn't already frozen and thawed.
Yes. As long as the meat has been thawed and handled in a safe manner prior to cooking, then you can freeze the cooked meat. A lot of people cook meals ahead of time for convenience.