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Sounds like it was leftover pickle brine, and I'm going to go out on a limb and guess it was cucumbers sliced into disks with a crinkle-cutter blade before pickling.

DAHAHAHA 🤮🤮 I would do that on a prank to someone. Vinegar egg bombs guaranteed to make you puke. 😂

They are just pickles that are sliced in a jar. Foe the lazy people that don't want to cut their own. Plus they add spices and such in the brine to add different flavors