1. Meat preparation:
2. Dry fry the ground meat in a non-stick pan, breaking it up with a fork (like for a bolognese sauce) and season with salt, pepper, and a pinch of dried oregano.
3. Set aside.
4. Vegetable preparation:
5. Wash the eggplant and cut it into cubes (without peeling it).
6. Peel and chop the onion and garlic clove.
7. Heat a tablespoon of olive oil in a saucepan and sauté the onion until translucent.
8. Add the diced eggplant. Sauté for 5 minutes, stirring.
9. Add the peeled tomatoes with their juice, garlic, salt, pepper, bouquet garni, and a good pinch of dried oregano.
10. Mix well and simmer covered (with the lid slightly ajar) for 20 minutes.
11. If there is too much liquid after 20 minutes, let it reduce a bit without the lid. Remove the bouquet garni.
12. Mix the ground meat with the vegetables.
13. For the mashed potatoes:
14. Peel the potatoes and cook them in salted water for about 20 minutes (depending on the size of the potatoes).
15. Drain the potatoes and mash them using a potato masher.
16. Add a knob of butter, milk, pepper, grated nutmeg, and a "good" drizzle of olive oil (about 3-4 tablespoons).
17. Mix well. The mashed potatoes should be neither too dry nor too soft.
18. Then add 50g of freshly grated Parmesan cheese and mix well.
19. Assembling the dish:
20. In an ovenproof dish, layer the mashed potatoes, then the vegetable-meat mixture, and finish with a layer of mashed potatoes.
21. Sprinkle with grated Parmesan cheese. Cover with aluminum foil.
22. Preheat the oven to 180°C (350°F). Place the dish in the oven and bake for 25 minutes. Remove the aluminum foil and let it brown for 5 minutes.
23. Serve hot. Enjoy your meal!