Mama's Best Lasagna

Bahan-bahan (12 porsi)

• 1 tablespoon olive oil
• 1 onion (finely chopped)
• 1 carrot (finely diced)
• 4 cloves garlic cloves (minced)
• 24 ounces ground beef mince
• 10 ounces ground pork mince (or beef)
• 24 ounces Passata
• 14 ounces crushed tomatoes
• 3 tomato paste (heaped tablespoons. I use garlic and herb flavoured.)
• 2 beef bouillon cubes (or vegetable, crushed)
• 1 teaspoon dried oregano
• 1 teaspoon dried basil
• 1/2 teaspoon sugar (if desired)
• 1/4 teaspoon salt (season to your tastes)
• 1/4 teaspoon black pepper (season to your tastes)
• 4 tablespoons butter
• 1/4 cup flour (all purpose or plain)
• 2 1/2 cups milk
• 1 cup shredded parmesan (fresh )
• 13 ounces fresh lasagna sheets
• 17 ounces fresh mozzarella cheese (shredded)
• 2 tablespoons fresh parsley (finely chopped )