1 tablespoon olive oil
1 tablespoon butter
1/2 pound pancetta (Italian bacon), diced
2 cups chopped celery
1 3/4 cups chopped carrots
1 1/4 cups chopped onion
1 1/2 pounds coarsely ground chuck
1 pound coarsely ground pork shoulder
salt and ground black pepper to taste
1 cup dry white wine
1 1/2 cups no-salt crushed tomatoes in puree
2 tablespoons tomato paste
1 teaspoon white sugar (optional)
1/2 cup beef broth (optional)
1/2 cup heavy whipping cream
1/2 cup whole milk
Bechamel Sauce:
5 tablespoons butter
1/4 cup all-purpose flour
4 cups whole milk
1 bay leaf
1/2 teaspoon salt
1/4 teaspoon freshly grated nutmeg
8 (9x13-inch) fresh lasagna sheets
2 cups finely grated Parmesan cheese, divided
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Heat olive oil and 1 tablespoon butter in a large Dutch oven over medium heat. Add pancetta; cook and stir until browned, about 8 minutes. Add celery, carrots, and onion; cook, stirring occasionally, until very soft, about 15 minutes. Stir in beef and pork. Season with salt and pepper. Cook until evenly browned, about 20 minutes.
Pour white wine into the Dutch oven; cook until alcohol evaporates, about 5 minutes. Stir in crushed tomatoes, tomato paste, and sugar. Bring to a simmer; reduce heat to low, cover and simmer Bolognese sauce, stirring occasionally and skimming fat off the surface, about 3 1/2 hours. Stir in beef broth, 1/4 cup at a time, if the sauce looks dry.
Stir heavy cream and 1/2 cup milk into the Bolognese sauce; mix well. Cover and cook over very low heat until flavors combine, about 30 minutes.
Melt 5 tablespoons butter in a large saucepan over medium heat. Stir in flour until smooth paste forms; cook and stir until the paste turns a golden sandy color, about 7 minutes.
Increase heat to medium-high and slowly whisk 4 cups milk into the saucepan. Bring to a gentle simmer; reduce heat to medium-low and add the bay leaf. Continue simmering, stirring occasionally until bechamel sauce is thick and smooth, about 10 minutes. Season with salt and nutmeg; discard bay leaf.
Preheat oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking dish with butter.
Spread 1/4 cup bechamel sauce in the bottom of the baking dish. Cover with 1 lasagna sheet; prick in several places with a paring knife. Spread 1/2 cup bechamel sauce and 1/2 cup Bolognese sauce on top. Sprinkle 1/4 cup Parmesan cheese on top.
Repeat layers 7 times with remaining lasagna sheets, bechamel sauce, Bolognese sauce, and Parmesan cheese. Cover lasagna with aluminum foil and place on a rimmed baking sheet.
Bake lasagna in the preheated oven until bubbly, about 25 minutes. Remove aluminum foil and continue baking until cheese is browned, about 20 minutes more. Let cool before serving, about 15 minutes.
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