• Preheat oven to 200°C.

  Prepare your ingredients.
  

Preparing the eggplant

• Add little salt to the eggplant slices, and strain for 10 minutes in a colander. This step is necessary to drain the eggplants.
  
• Place the eggplant slices onto a baking sheet lined with parchment paper, and brush with olive oil.
  
• Bake the eggplant slices in the oven for around 30 minutes.
  

Preparing the sauce

• Add salt and pepper to the grated onion.

  Sauté the onion in a greased saucepan, stirring occasionally till tender.
  
• Add the tomato juice, and stir on low heat until the sauce starts bubbling.
  

Assembling the casserole

• Coat the casserole with oil, then Add half the amount of the eggplant.
  
• Top the eggplant with a layer of cottage cheese.
  
• Add the rest of the eggplant slices.
  
• Finally, Spread the tomato sauce and walnuts (optional) on top.
  
• Bake in the preheated oven for about 30 minutes until browned and bubbly.
• Serve and enjoy hot with Greek tzatziki sauce.