Prepare two 'cartoccio' using aluminum foil and parchment paper, ensuring they are large enough to encase all the ingredients while leaving room for the steam to circulate.
Start with a bed of fennel, followed by tomatoes, olives, capers, and parsley. Season with salt, pepper, and a drizzle of olive oil, then splash in the white wine for an added depth of flavor.
Season the seabass inside and out, stuff the cavity with lemon slices, and lay it atop the vegetable bed.
Seal the cartoccio carefully, place it on a baking tray, and cook in a preheated oven at 180°C for 30 minutes. Once done, let it rest for 5 minutes before unveiling the feast within.
Place the fennel at the bottom, top with tomatoes, olives, capers and parsley. Season with salt, pepper, olive oil and white wine.
Season the seabasses, place the lemon slices in the cavity and place at the top of the vegetables.
Carefully close the cartoccio and place on a baking tray.
Bake in a preheated oven at 180C for 30 minutes. Then remove and let it rest for 5 minutes before serving