Chop the onion, celery, and carrot.
Add olive oil to a pan and sauté the chopped vegetables.
Add the minced beef and pork, and cook together.
Pour in tomato sauce and herbs, and simmer.
Boil the lasagna noodles.
Prepare the béchamel sauce.
In an oven-safe dish, layer the lasagna noodles, ragu sauce, béchamel sauce, and cheese in order.
Bake in a preheated oven at 180°C (356°F) for 30 minutes.