Veggie Lasagna

Ingredients

• 2 tbsp oil
• 1 onion , sliced
• 1 garlic clove , sliced
• 1 aubergine (eggplant) , cut into chunks
• 1 red pepper , sliced
• 8 plum tomatoes , halved
• 350ml passata (tomato puree)
• 200g ready-cooked lasagna sheets
• 6 tbsp half-fat crème fraîche
• 2 tbsp grated parmesan (or vegetarian alternative)