INGREDIENTS
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2 1/2 pounds plums, pitted
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1 cup lightly packed brown sugar
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1/2 granulated sugar
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1/2 cup cider vinegar
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1/2 small onion, finely chopped (about 1/3 cup chopped)
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1 tablespoon finely chopped green pepper (such as jalapeño or serrano, or a milder poblano if you don't like the heat)
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1 tablespoon whole yellow mustard seeds
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1/2 tablespoon kosher salt
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1 garlic clove, minced
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1/2 tablespoon finely chopped fresh ginger