TRADITIONAL LASAGNA BOLOGNESE

Steps:

• Bring sauce to room temperature. In a large bowl, whisk together ricotta, egg yolks, Parmesan, 1 1/2 teaspoons salt, black pepper, nutmeg, and cayenne pepper. Chill filling until ready to assemble lasagna.
• Preheat oven to 400 degrees. Butter an 11-by-14-by-3-inch lasagna baking pan. Bring a large pot of water to a boil. Add olive oil and remaining tablespoon of salt. One at a time, add lasagna noodles; cook until very al dente, 2 to 3 minutes less than the manufacturer's instructions. Remove noodles with tongs; drain in a colander.
• Spread about 3 cups of sauce on the bottom of the prepared baking dish. Place a single layer of lasagna noodles over the sauce, overlapping them slightly. Spread about 2 cups sauce over the noodles and about half the ricotta filling mixture over the sauce.
• Top with a layer of lasagna noodles, again slightly overlapping them. Repeat with more sauce and remaining ricotta filling mixture. Top with a final layer of lasagna noodles. Spread a layer of sauce over the noodles, and finish with a layer of sliced mozzarella rounds.
• Bake until the sauce is bubbling and the cheese is melted, at least 1 hour. Cover with aluminum foil if the cheese starts to brown too early. Let the lasagna stand 10 to 15 minutes before serving.