2: Pour 4 tablespoons olive oil into a large saucepan on medium heat. When hot, add the onions and cook for 2 minutes without colouring. Salt and pepper.
3: Add the minced beef and cook, stirring from time to time. Set aside.
5: Pour 2 tablespoons olive oil into a large saucepan on medium heat. When hot, add the courgettes and cook for 5 minutes, then salt and pepper. Set aside.
6: Prepare 2 tomatoes (while it is not essential to peel them, it is better), slice and fry in 2 tablespoons olive oil, then salt and pepper on both sides.
7: Preheat the oven to 390°F (200°C). Begin assembling the gratin: use a buttered gratin dish and spread the sautéed courgettes in the bottom.
8: Cover with a layer of minced beef.
9: Cover with a layer of bechamel.
10: Then add the tomatoes.
11: Then a final layer of meat.
12: Finish with another layer of bechamel and the grated cheese.
13: Cook in the oven until the top is nicely browned.
Remarks
For the cheese topping, I prefer Comté, but use whatever you like. Of course, Parmesan would be more Italian.