1. Slice the onions.
Crush the garlic clove.
Finely chop the carrot and celery.
2. Sauté the garlic clove and onions in a little olive oil.
3. Add the chopped carrot and celery stalk.
4. Add the meat and sauté everything.
5. After a few minutes, add the red wine and let it cook until it evaporates.
6. Add the tomato puree, water, and herbs.
7. Season with salt and pepper, and let it simmer over low heat for 45 minutes.
8. Béchamel preparation:
Melt 100 grams of butter.
9. Then, off the heat, add the flour all at once.
10. Put it back on the heat and whisk until you obtain a smooth mixture.
11. Gradually add the milk.
12. Stir until the mixture thickens.
13. Then, season with nutmeg, salt, and pepper.
Let it cook for about 5 minutes over very low heat, stirring, then set aside.
14. Preheat the oven to 200°C (thermostat 6, 7).
15. Grease the lasagna dish.
Spread a thin layer of béchamel, then:
16. Some lasagna sheets,
Then the bolognese sauce,
Then the béchamel sauce,
And some parmesan cheese.
Repeat this several times.
17. On the last layer of lasagna, only add béchamel sauce and cover with grated cheese.
Then sprinkle a few knobs of butter.
Make sure the last layer of pasta is well covered with sauce, and add water if necessary to ensure it cooks well.
18. Bake for about 25 minutes.
Enjoy.