Vegan Lasagna

Ingredients

• 3 eggplants ((ca 800 – 1000 g))
• 3 tsp salt
• 10 tbsp olive oil
• 1 onion
• 2 cloves garlic
• 1 tbsp olive oil
• 2 cups passata (tomato purée) (400 g)
• 3 tbsp tomato paste (140 g)
• 1 tsp salt
• ½ tsp ground black pepper
• 1 tsp dried oregano or basil
• 2 pounds mushrooms (1 kg)
• 2 whole onions
• 3 tbsp olive oil
• 1 tsp pepper
• 24 lasagna sheets (egg-free, made with durum wheat)