INGREDIENTS
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8 Roma tomatoes (equal size, 1 1/2 lb. total), rinsed and cored
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1 onion (about 8 oz.), peeled and finely chopped
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3/4 cup balsamic vinegar
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1/2 cup firmly packed brown sugar
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2 tablespoons extra-virgin olive oil
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1 tablespoon minced fresh ginger
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About 2 cups arugula leaves, stemmed, rinsed, and drained
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Salt