INGREDIENTS
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5 cups coarsely chopped green tomatoes
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5 cups coarsely chopped cabbage
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1 1/2 cups finely chopped yellow onion or sweet onion
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2 cups coarsely chopped bell pepper, at least 1 red for color
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1/3 cup kosher salt or pickling salt
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2 1/2 cups cider vinegar
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1 cup light brown sugar, packed
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1 tablespoon yellow mustard seeds
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2 cloves garlic, finely minced
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1 teaspoon celery seed
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1/2 teaspoon red pepper flakes, or to taste, optional