Three Meat Lasagna

Name: Three Meat Lasagna
Ingredients: 1 package no-boil lasagna sheets; 1 cup mozzarella cheese, shredded; 1/2 cup Parmesan cheese, shredded; 4 tablespoons unsalted butter; 4 tablespoons flour; 2 2/3 cups milk; Salt and freshly ground pepper to taste; Freshly grated nutmeg to taste; 3 tbsp olive oil; 4 oz pancetta, finely chopped; 1 onion, chopped; 2 celery stalks, chopped; 1 small carrot, chopped; 4 ounces ground veal; 4 ounces ground pork; 8 ounces ground beef; 2/3 cup red wine; 1 1/2 cups chicken stock; 2 cups milk; 32 oz canned plum tomatoes, roughly crushed; Salt and freshly ground black pepper to taste