INGREDIENTS
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1/4 cup extra-virgin olive oil
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1 medium Spanish onion, finely chopped
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12 ounces porcini mushrooms, trimmed and finely chopped
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1/2 cup dry red wine
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1 cup Mario Batali's Basic Tomato Sauce Mario Batali's Basic Tomato Sauce
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1 tablespoon unsalted butter
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Coarse salt and freshly ground pepper
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1 1/4 pounds Mario Batali's Fresh Tagliatelle
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Freshly grated Parmigiano-Reggiano, for garnish