Creamy Spring Vegetable and Ham Pasta

Name: Creamy Spring Vegetable and Ham Pasta
Ingredients: 8 ounces fettuccine or other pasta; 1/4 cup unsalted butter; 1 cup leeks, thinly sliced, white and light green parts only; 1/2 pound asparagus, trimmed and cut into thirds; 2 cups chopped ham; 1 Tablespoon minced fresh garlic; 1 cup frozen green peas; 1 1/2 cups heavy cream; 1/2 teaspoon salt; 1/4 teaspoon ground nutmeg; 1/4 teaspoon freshly ground black pepper; 2 ounces Parmesan cheese, grated; Fresh parsley sprigs for optional garnish