3 tablespoons extra virgin olive oil
3 tablespoons butter
1 pound fresh mushrooms, sliced thin
1/2 pound Prosciutto, cut in bits
2 large ripe tomatoes, peeled, seeded, and chopped into 1/2-inch cubes (or 1/2 cup tomato puree
1 cup of baby peas
1/4 teaspoon ground nutmeg
2 fresh sage leaves, chopped fine (or 1 teaspoon dried sage leaves, rubbed)
1 cup heavy cream
1 pound fettuccine
Salt
Freshly ground black pepper
1 cup freshly grated Parmesan cheese
1/2 cup finely chopped flat parsley
2/3 cup walnuts, toasted (optional)