The first thing to do is to salt the aubergines or eggplants.
Cut them into thin slices and put them in a colander inside a bowl or sink.
Sprinkle them lightly with salt and leave them for 1 hour. This helps remove excess water and makes them easier to fry.
While waiting, you can make a simple tomato sauce.
Chop 1 onion finely and cook it in a little olive oil until it becomes translucent.
Then, add the tomato passata (pureed tomatoes) and a small bunch of basil torn with your hands.
Sprinkle in a pinch of salt and pepper, stir, and let it simmer gently for 10-15 minutes. Set it aside.
Next, wash the aubergines/eggplant with cold water to remove the salt, and dry them with a kitchen towel or paper. Then, coat them lightly in flour, remove any excess, and fry them in sunflower oil for a few seconds on each side, then drain.
Preheat your oven to 180°C (350F). Spoon a small amount of tomato sauce into the bottom of a baking dish and spread it around to prevent the aubergines from sticking.
Next, add a layer of aubergines to the dish, then sprinkle parmesan cheese, add cubes of mozzarella, sprinkle some pepper, and a little more tomato sauce.
Repeat these layers until you have one layer left (photos 9-11).
For the final layer, spoon over the remaining tomato sauce and top with parmesan and mozzarella.
Loosely cover with foil and bake for 20 minutes, then remove the foil and bake for another 20 minutes until golden and bubbling on top