Spinach and Porcini Stuffed Manicotti

Name: Spinach and Porcini Stuffed Manicotti
Ingredients: 1 ounce dried porcini; 1 cup hot water; 1 cup minced red onion; 2 tablespoons unsalted butter; 1 1/2 cups cooked and drained spinach, chopped; 2 teaspoons minced garlic; 1 15-ounce container ricotta cheese; 1/2 cup coarsely grated mozzarella; 1 cup grated locatelli cheese; 1 large egg, beaten lightly; Salt and pepper to taste; Freshly grated nutmeg to taste; 8 manicotti shells; 3 tablespoons unsalted butter; 3 tablespoons flour; 1 1/2 cups milk, heated; Freshly grated nutmeg; Snipped fresh chives or minced parsley for garnish if desired