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NO
If the food has been thawed under refrigeration and has not started to spoil, food can be safely refrozen. Partially thawed can be refrozen, too. But the extra freeze-thaw cycle will cause degradation of quality. It might be better to cook the food, then freeze it.
Yes
no because they have froze
It is not recommended to eat any foods that have been frozen, thawed and refrozen. You can, however, thaw food, cook it, and then freeze it.
No foods should be refrozen after they have thawed.
Yes
no once it has thawed you cannot refreeze it
Yes, you shouldn't have any problem with this. I don't think I'd do it if the spaghetti sauce was made with clams or poultry but if it's vegetarian or beef-based, you should be fine.
If the garlic sausage was already frozen, it is not recommended to refreeze it once it has thawed. The safest bet would be to cook it and save leftovers in the refrigerator.
It is best not to re freeze thawed food. However if you cook the thawed rhubarb first, and allow it to cool you can then freeze the cooked rhubarb.
Yes they can. For up to a year.