Prepare the celery into your desired shape and size. Stuff it into a wide-mouthed jar with a lid (at least 16 ounces).
Combine the white wine vinegar, water, granulated sugar, salt, peppercorns, and red pepper flakes in a saucepan. Cook over medium heat, stirring occasionally, until the salt and sugar dissolve.
Pour the brine over the celery in the jar. Add the fresh dill. Stir gently.
Let the brine come to room temperature before sealing and transferring to the fridge. You can now enjoy the celery, or keep it in the fridge overnight if you want it to have a stronger taste.
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How long does it last? Keep in a sealed jar in the fridge for up to 2 weeks. Please note this is a quick pickle recipe and is not intended to be suitable for canning or shelf-stable pickling.