INGREDIENTS
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Salt and freshly ground pepper
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1 lb dried penne
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¼ cup extra-virgin olive oil
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1 medium Spanish onion, finely chopped
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12 oz portobello or button mushrooms, finely chopped
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½ cup dry red wine
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1 cup jarred tomato sauce
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1 Tbsp unsalted butter
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1 lb fresh buffalo mozzarella, cut into ½-inch cubes
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Parmigiano-Reggiano, for topping