Thoroughly rinse the fresh parsley leaves, drain well, and pat dry with paper towels.
In a saucepan, combine the white wine vinegar, water, brown sugar, and salt. Heat over medium heat, stirring until the sugar is completely dissolved.
Add the thinly sliced garlic, bay leaf, black peppercorns, red pepper flakes, and lemon juice. Simmer over low heat for 3 minutes to allow the flavors to meld.
Pack the parsley leaves into sterilized jars, then pour the hot brine over them, ensuring they are fully submerged.
Seal the jars and let them cool to room temperature. Refrigerate for at least 12 hours before serving to allow the flavors to fully develop.
Serve chilled as a unique pickled condiment or side dish for meat and salad dishes.
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