INGREDIENTS
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1 pound Brussels sprouts, trimmed and halved
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1 large red onion, cut into 1-inch wedges, stem ends left intact
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2 tablespoons olive oil
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kosher salt and black pepper
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2 tablespoons pure maple syrup
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2 tablespoons whole-grain mustard
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1 1/2 pounds skinless salmon fillet, cut into 4 pieces
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lemon wedges, for serving