"The sweetness of the onions is a nice contrast to the strong taste of the brussels sprouts. Garnish with toasted hazelnuts if desired...."
INGREDIENTS
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1 (about 10-ounce) basket brussels sprouts
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Salt and freshly ground black pepper
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1 tablespoon unsalted butter
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1 tablespoon olive oil
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1 small red onion, thinly sliced lengthwise
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2 tablespoons balsamic vinegar