1 lb ground beef 1/2 lb Italian sausage (casings removed) 1 onion (finely chopped) 3 cloves garlic (minced) 1 can (28 oz) crushed tomatoes 2 tablespoons tomato paste 1/2 cup red wine (optional, for depth of flavor) 1 teaspoon dried basil 1 teaspoon dried oregano 1/2 teaspoon red pepper flakes (optional, for a bit of heat) Salt and black pepper (to taste) 2 tablespoons olive oil For the Béchamel Sauce: 4 tablespoons unsalted butter 1/4 cup all-purpose flour 2 cups whole milk 1/2 teaspoon ground nutmeg Salt and black pepper (to taste) For the Lasagna Assembly: 12 lasagna noodles (cooked according to package instructions) 2 cups shredded mozzarella cheese 1 cup grated Parmesan cheese 1 cup ricotta cheese 1 cup chopped fresh spinach (or other vegetables like mushrooms or bell peppers) 1 cup cooked and crumbled bacon (optional, for added richness) Fresh basil or parsley (chopped, for garnish)