Green Canneloni Stuffed with Ricotta Cheese and Spinach

Name: Green Canneloni Stuffed with Ricotta Cheese and Spinach
Ingredients: Fresh Spinach Pasta sheets (8 to 12 ounces); 3 tablespoons unsalted butter; 3 tablespoons flour; 2 cups milk; Salt, pepper and pinch nutmeg; 8 ounces ricotta cheese; 1 cup freshly grated Parmesan; 2 eggs and 2 egg yolks; 10 ounces spinach, stemmed, washed; 1/3 cup finely minced shallots; 2 tablespoons unsalted butter; Salt and pepper; 1/3 cup grated Parmesan cheese; 4 tablespoons chilled cubed unsalted butter; Parmesan cheese