Finely chop onion, garlic, carrot, and celery.
Heat olive oil in a pan and sauté the minced beef.
Add the chopped vegetables and stir-fry together.
Pour in the tomato sauce and season with salt and pepper.
Blanch the lasagna noodles in boiling water.
In an oven-safe dish, layer the sauce, noodles, and cheese in order.
Bake in a 200°C oven for 30 minutes.