INGREDIENTS
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1 small red onion, peeled and cut into 1/8-inch slices
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1 tablespoon red wine vinegar
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1 dash kosher salt and black pepper
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3 tablespoons olive oil
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1 pound Italian sausage (hot or sweet), casings removed
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1.5 pound brussels sprouts, trimmed and halved
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1 cup flat-leaf Italian parsley, tender leaves and stems (about 1/2 bunch), roughly chopped