Pastitsio Greek Lasagna

Name: Pastitsio - Greek Lasagna
Ingredients: 1 1⁄2 lbs ground lamb or 1 1⁄2 lbs ground beef; 1 medium onion, diced; 2 garlic cloves, minced; 1⁄2 teaspoon cinnamon; 1 cup tomato sauce; 4 tablespoons butter; 4 tablespoons flour; 3 cups milk; 12 ounces penne pasta; 2 eggs, lightly beaten; 1⁄2 cup grated parmesan cheese