First, add the ground beef, parsley, breadcrumbs, tomato paste, salt, pepper, garlic, and eggs to a bowl and carefully knead everything together by hand.
Now use two thirds of the meat mix to line a loaf pan (ideally 4½ in x 8½ in), including the inside edges. The mix should be pressed down so that it is level and about 1 inch thick. You now have a rectangular meat mold in which to put the lasagna sheets, cream cheese mix, and cheese. Begin by placing a lasagna sheet inside.
Next, mix the cream cheese with the pepper, nutmeg, and salt. Now take a large spoonful of this mixture and spread it on top of the lasagna sheet. Three slices of cheese are then placed on top of this. Repeat this process two more times. For the top layer, use up the rest of the cream cheese, before placing the final slices of cheese and a lasagna sheet on top.
Use the rest of the ground meat mixture to create a 'lid' to cover the last sheet of lasagna.
Cook everything in a convection oven at 320°F for 30 minutes.
The highlight of the dish is the tasty sauce. Start by sweating the onions and garlic in olive oil. Next, add butter and leave the mixture to caramelize. Now add the balsamic vinegar to deglaze and leave everything to cook for a short while. To finish, stir in the tomato paste, sieved tomatoes, salt and pepper. Leave everything to cook for a while.
Place the lasagna meatloaf on a tray covered with baking parchment and pour the tomato sauce on top. Place the three remaining slices of cheese on top as the garnish. Before digging into your tasty creation, place it back into the oven once more — this time for 10 minutes at 390°F with the top heat on.