Melt the butter over a low heat in a pan, then add the flour. Stir until combined, and cook on low for 1-2 minutes. Whisk in the milk gradually until you have a sauce. Add a pinch of salt and pepper. Keep whisking until the sauce thickens. Once done, set it aside.
Add the pork and beef meat and cook until browning. Add the beef broth pot, then the bay leaves, basil, and mixed herbs, and give it a good stir.
Add the Worcestershire sauce, then the red wine and let it all simmer. Then add the canned tomatoes. Give it a good stir, turn down the heat, and let the bolognese simmer for around 40 minutes, stirring occasionally.
Preheat the oven to 300 F. Once the bolognese is ready, layer the lasagna in a baking dish.
Start by first adding a third of each of the bolognese, then the lasagna noodles, then the bechamel sauce. Repeat two more times.
Top with the Parmesan and torn mozzarella, then bake for 45 mins, until piping hot and crisp on top. Serve immediately.