Chop pancetta, carrot, celery, and onion into small 1/4-inch cubes. In a large skillet, brown the pork loin with lard and olive oil.
Add chopped vegetables and pancetta, cooking until softened. Stir in tomato purée and a splash of red wine; let simmer for at least 2 hours.
Finely chop half of the pork loin and return it to the sauce. Combine the other half with one egg, bread crumbs, and grated Parmigiano to form meatballs.
Pan-fry meatballs in hot oil until golden brown. Preheat oven to 350°F (175°C).
Slice mozzarella, brown sausage, and strain ricotta with an egg, Parmigiano, salt, and pepper.
Cook lasagna sheets in salted water for about three minutes, then drain and lay in a greased baking dish.
Layer the ingredients: pasta sheets, ricotta, sauce, meatballs, sausage, and mozzarella. Repeat until all ingredients are used, finishing with sauce and mozzarella.
Bake for 20 minutes until cheese is melted and golden. Let rest before serving.
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Notes
Store leftovers in an airtight container in the refrigerator for up to three days. Reheat in the oven for best results.