01 -
Preheat oven to 350°F. Heat olive oil in a large heavy-bottomed pot over medium-high heat. Add ground beef and diced onion. Sauté, breaking up the beef, until fully cooked. Add garlic and tomato paste, cooking for 1 minute while stirring.
02 -
Add tomato sauce, crushed tomatoes, and Italian seasoning to the pot. Stir well. Bring the mixture to a boil, then reduce heat to low. Cover with a lid and simmer for 10-15 minutes. Adjust seasoning with salt and pepper. Add a bit of water if the sauce appears too thick.
03 -
In a bowl, combine ricotta cheese, freshly chopped parsley, 1/4 cup parmesan cheese, and a pinch of salt and pepper. Adjust seasoning to taste. Mix in the egg until well combined.
04 -
Spread 2 cups of prepared sauce on the bottom of a 9x13-inch casserole dish. Layer 4-5 lasagna sheets over the sauce. Spread 1/3 of the ricotta mixture over the noodles, top with 2/3 cup mozzarella, then 1 2/3 cups sauce. Repeat this process (starting with noodles) twice more. Finish with 4-5 lasagna sheets, the remaining sauce, remaining mozzarella, and 1/2 cup parmesan cheese.
05 -
Cover the casserole dish with foil and bake for 45-55 minutes. Check doneness by stabbing the middle with a knife to test the tenderness of the noodles. Once tender, remove the foil and bake for an additional 15 minutes. Optionally, broil for 1-3 minutes for a browned top.
06 -
Let the lasagna rest for 15 minutes before slicing and serving.