Ingredients
- 6 medium zucchini (about 3 1/2 pounds)
- 3 cups apple cider vinegar
- 3 cups distilled white vinegar
- 6 tablespoons pickling salt (see recipe note)
- 3 teaspoons mustard seeds
- 6 cloves garlic , halved
- 6 sprigs fresh dill
- 18 whole black peppercorns
- 1 1/2 teaspoons crushed red pepper flakes , divided (optional)
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