Pastitsio (Greek Lasagna)

Bahan-bahan (10 porsi)

• 6 tablespoons unsalted butter
• ¾ cup all-purpose flour
• 1 quart whole milk, (warmed until hot)
• 1½ teaspoons salt
• 3 large eggs
• 4 tablespoons unsalted butter
• 2 medium onions, (chopped)
• 2 pounds 90% lean ground beef
• ⅛ teaspoon ground cinnamon
• salt and pepper, (to taste)
• ½ cup water
• 2 tablespoons tomato paste
• 1 pound ziti pasta
• 3 large eggs, (beaten)
• 1½ teaspoons salt
• 12 to 16 ounces Kasseri or Kefalotiri cheese, (grated (see notes below))