well freezer=ice ice=water thus being watery :)
The thing if cooked frozen is that thing you cooked frozen.
Yes you do cook lasagna before freezing it.
Yes, Trader Joe's carry a few varieties of frozen lasagna.
Food which has been cooked can be frozen, even if it was frozen prior to cooking. BUT Frozen food which has been thawed, but not cooked, should never be re-frozen. Nor should food which was cooked, frozen and thawed.
Lasagna is suitable for freezing because all of its components freeze and it doesn't separate when frozen.
No. If you're cooking 2 pans of frozen lasagna, put them both in the oven at the same time and follow the directions as if you were cooking just one.
No, it goes really watery when you defrost it.
Not really, it will be very watery and will lose its texture. If you do freeze it, then before you are ready to serve it, try to cook it again for another 20 minutes (while its still frozen).
sit it in some hot water
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 unfreeze frozen food that has been already cooked and eat it