INGREDIENTS
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3 1/2 cups apple cider vinegar
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1 cup water
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1 cup sugar
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2 tablespoons kosher salt
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3 pounds zucchini, peeled, seeded and shredded
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1 tablespoon yellow mustard seed
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1 tablespoon brown mustard seed
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1 tablespoon chili flakes
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1/2 tablespoon celery seed