Bring a large pot of salted water to a boil and cook the pasta until al dente. Drain and set aside.
In a large skillet, heat the olive oil over medium heat. Sauté the diced onion and garlic until softened. Add the ground meat and cook, breaking it up with a spoon, until browned.
Pour in the tomato sauce and season with cinnamon, oregano, salt, and pepper. Simmer over low heat for 15-20 minutes, or until the sauce has thickened slightly.
Prepare the béchamel sauce: melt the butter in a saucepan, whisk in the flour, and gradually add the milk, whisking constantly to prevent lumps. Season with salt, nutmeg, and grated Parmesan cheese. Cook until thickened.
Spread the cooked pasta evenly in the bottom of a baking dish. Pour the meat sauce over the pasta. Top with the béchamel sauce and sprinkle with the remaining grated Parmesan cheese.
Bake in a preheated oven at 350°F (180°C) for 30-35 minutes, or until the top is golden brown and bubbly.
Let the pastitsio rest for 10 minutes before slicing and serving. Serve hot with a fresh salad.
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