Pickled Pepper and Onion Relish

Pickled Pepper and Onion Relish
Ingredients :
4 cups mixed bell peppers, thinly sliced
2 large onions, thinly sliced
1 cup white vinegar
1 cup apple cider vinegar
1 cup granulated sugar
1 tablespoon mustard seeds
1 teaspoon celery seeds
1 teaspoon turmeric powder
1 teaspoon salt
1/2 teaspoon ground black pepper
1/2 teaspoon red pepper flakes (optional)
Directions :
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