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