Chop the onion and carrot finely.
Sauté the onion and carrot in a pan with olive oil.
Add ground beef and pork, and cook until browned.
Stir in tomato paste and minced garlic, and continue to sauté.
Add chopped tomatoes and herbs, bring to a simmer to complete the ragù sauce.
Prepare the béchamel sauce.
In an oven-safe dish, layer the lasagna sheets, ragù sauce, béchamel sauce, and cheese in that order.
Bake in a preheated oven at 200°C for 25 minutes, then let it rest for 5 minutes.