Thoroughly wash the grapes and pat them dry with a clean kitchen towel.
Select a clean canning jar and place the grapes inside.
In a saucepan, bring to a boil the water, white wine vinegar, honey, brown sugar, salt, cinnamon stick, cloves, bay leaves, black peppercorns, and mustard seeds.
Once the pickling liquid has come to a boil, let it cool slightly so it's not too hot when poured over the grapes.
Pour the cooled pickling liquid over the grapes, ensuring they are completely submerged.
Seal the jar and refrigerate for at least 24 hours. 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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