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Re-freezing thawed preserves. Is this safe?

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I have home-made freezer jams and frozen pesto.
I'd like to take them as gifts to families & friends in Europe. During overnight flight (in the summer) destination, these preserves will likely thaw. I will meet some families & friends 2-3 weeks after my arrival. Is it alright to re-freeze them upon my first arrival? Are they safe for consumption? Appreciate any advice.


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