Vegetarian Moussaka - Master recipes

Ingredients

• 2 medium eggplants, sliced into 1/2" rounds -
• Kosher salt -
• 4 tbsp. extra-virgin olive oil, divided -
• 1 medium yellow onion, chopped -
• 8-oz. baby bellas, sliced -
• 3 cloves garlic, minced -
• 1 c. green lentils -
• 1 (14.5-oz.) can diced tomatoes -
• 2 c. water -
• 1 tsp. dried oregano -
• Freshly ground black pepper -
• 2 tbsp. butter -
• 2 tbsp. all-purpose flour -
• 2 c. milk -
• 3/4 c. freshly grated Parmesan, divided  -
• 2 large egg yolks  -