Classic Greek Moussaka

Ingredients

• 1 tbsp olive oil
• ½ cup grated Parmesan cheese
• 5 tbsp all-purpose flour
• 2 tsp dried oregano
• 2 garlic cloves, minced
• 1½ tsp sugar
• 1 cup beef broth
• 3 cups low-fat milk
• 3 tbsp tomato paste
• 2 large eggplants, sliced into ¼-inch thick rounds
• 1 egg
• 1.4 lb ground beef
• 2 tbsp olive oil
• 1 onion, diced
• 1 egg yolk
• ¾ tsp salt
• 4 tbsp butter
• ⅓ cup panko breadcrumbs
• Salt and pepper, to taste
• ¼ tsp freshly grated nutmeg
• 14 oz crushed tomatoes