Spaghettini Ticino
["3/4 lb. mushrooms", "7 Tbsp. sweet butter", "2 Tbsp. finely minced scallions (both white and green parts)", "1 small garlic clove, mashed", "salt and freshly ground white pepper", "1 c. diced Prosciutto", "1 lb. thin spaghettini (Ronzoni No. 9)", "1 1/2 c. heavy cream", "1/2 c. freshly grated Parmesan cheese", "freshly ground black pepper"]
["Do not wash the mushrooms.", "Wipe them with a damp paper towel and slice them, reserving the stems for stock or soup.", "In a large skillet heat 3 tablespoons of butter.", "When it is hot, add the mushroom slices and cook them without browning for 2 to 3 minutes. Add the onions and garlic and cook the mixture for 2 or 3 minutes. Season with salt and white pepper.", "Remove from heat and reserve. In a small skillet heat 2 tablespoons of butter.", "Add the Prosciutto, cover the skillet and cook for 5 minutes over low heat. Remove from heat and reserve."]
["mushrooms", "sweet butter", "scallions", "garlic", "salt", "thin spaghettini", "heavy cream", "freshly grated Parmesan cheese", "freshly ground black pepper"]