"A stupendous side-dish!..."
INGREDIENTS
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1 1/2 pounds broccolini (2 bunches), ends trimmed
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4 tablespoons olive oil (divided)
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1 teaspoon kosher salt (divided)
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1 small sweet onion, finely diced
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1/2 pound cremini or other mushrooms, thinly sliced
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1/4 cup dry white wine or vermouth
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1/4 teaspoon freshly ground black pepper
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Grated Parmesan for serving (optional)