"Balsamic-glazed Brussels sprouts with onion is a quick and easy side dish for weeknights or dinner parties...."
INGREDIENTS
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1 (16 ounce) package fresh Brussels sprouts
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1 small red onion, thinly sliced
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5 tablespoons olive oil, divided
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1/4 teaspoon salt
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1/4 teaspoon freshly ground black pepper
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1 shallot, chopped
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1/4 cup balsamic vinegar
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1 tablespoon chopped fresh rosemary