Step 1: Prepare the meat sauce

Heat olive oil in a large frying pan over medium heat. Add the chopped onion and garlic, cooking until softened. Add the ground beef or pork, breaking it up with a wooden spoon, and cook until browned. Stir in the tomato passata, season with salt and pepper, and simmer for 10-15 minutes. Add the fresh basil and set aside.

Step 2: Prepare the crème fraîche topping

In a bowl, mix the crème fraîche with a pinch of salt and grated Parmesan cheese until smooth.

Step 3: Assemble the lasagne

Preheat your oven to 180°C (350°F). Spread a thin layer of meat sauce on the bottom of a baking dish. Cover with a layer of lasagne sheets, followed by more meat sauce, a few slices of mozzarella, and a dollop of crème fraîche. Repeat the layers until all the ingredients are used, finishing with a layer of crème fraîche and mozzarella on top.

Step 4: Bake the lasagne

Cover the dish with foil and bake in the preheated oven for 25 minutes. Remove the foil and bake for another 10-15 minutes, or until the top is golden and bubbling.

Step 5: Rest and serve

Let the lasagne rest for 5-10 minutes before slicing. Serve hot with your favorite sides.