Place the sliced celery and garlic in a clean jar.
In a small saucepan over medium heat, combine the vinegar, water, sugar, salt, mustard seeds, black pepper, bay leaf, and optional chili flakes. Bring to a light simmer and stir until the sugar and salt dissolve.
Carefully pour the hot brine over the celery and garlic. Make sure the bay leaf goes in too.
Let the mixture cool to room temperature (about 30 minutes), then cover and refrigerate.
It’s ready to enjoy after 30 minutes, but the flavor improves after a few hours. It will keep in the refrigerator for up to 2 weeks.
Enjoy!
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Notes
I recommend using at least a 20-ounce jar. This swing-top jar is my favorite for quick pickling recipes, like this celery.Storage Pickled celery isn’t shelf-stable. Store it in the refrigerator for up to 2 weeks. Make sure the lid is tightly closed. Toss it once you notice any signs of spoilage, like sliminess or mold.