Thoroughly wash the oranges and slice them thinly, or cut them into segments, with the peel on.
Select a clean canning jar and place the orange slices inside.
In a saucepan, bring the water, white wine vinegar, honey, brown sugar, salt, cinnamon stick, cloves, bay leaves, black peppercorns, and mustard seeds to a boil.
Once the pickling liquid has boiled, let it cool slightly so it's not too hot when poured over the oranges.
Pour the cooled brine over the oranges, making sure they are completely submerged.
Seal the jar and refrigerate for at least 24 hours, but the longer they sit, the more flavorful they will become.
Before serving, let the jar stand at room temperature for 10 minutes to allow the flavors to fully develop.
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