Have you ever opened frozen concentrated juice and had it look less juicy and more syrupy? I have.

Refrozen juice

After looking at it strangely for a few minutes, and remembering that it'd been in the fridge for months on months, though still well within its due date, did you remember that someone'd left the freezer door open overnight not that long ago? Boy, I did.

And that's probably what happened, confirmed by New York State's Department of Agriculture:

Can Thawed Food Be Refrozen?

Guide to Safely Refreezing Thawed Food

Frozen Uncooked Foods
Thawed - but Cold
45 Degrees or Lower
Thawed - Warm
(Above 45 Degrees)
Fruit Yes Probably safe - but may have fermented
Fruit Juice Concentrate Yes - but flavor may be poor and reconstituted juice [may] separate No - may have fermented
[emph mine -mfn]

Thanks, yankees!

(Ok, yes, I'm mixing it in a growler. Unlike the Yankees, I couldn't find any pitchers.)

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