BA's Best Lasagna

Name: BA's Best Lasagna
Cuisine: Italian
Ingredients: 2 lb. ground pork; 1 lb. ground beef chuck (20% fat); Kosher salt, freshly ground black pepper; 2 Tbsp. extra-virgin olive oil; 2 oz. pancetta (Italian bacon) or slab bacon, chopped; 1 medium onion, finely chopped; 1 celery stalk, finely chopped; 1 medium carrot, peeled, finely chopped; 6 garlic cloves, sliced; 2 Tbsp. tomato paste; ¾ cup dry white wine; 1 28-oz. can whole peeled tomatoes; 1 cup low-sodium chicken broth; 1 cup whole milk; 7 Tbsp. unsalted butter; ¼ cup plus 3 Tbsp. all-purpose flour; 6 cups whole milk; 4 oz. Parmesan cheese, coarsely grated (about 1 cup); Pinch of cayenne pepper; Pinch of ground nutmeg; 1¼ lb. dried lasagna noodles (preferably De Cecco); Extra-virgin olive oil (for greasing)