Veg-packed meatball lasagne - Good Food Middle East

Ingredients

• 2½ tbsp olive oil
• 1 large onion, finely chopped
• 250g chestnut mushrooms, finely chopped
• 250g lean beef mince
• 1 medium egg
• 30g parmesan, plus an extra 2 tbsp
• 1 garlic clove, crushed
• 25g fresh white breadcrumbs
• 300g fresh pasta sheets
• 200g mozzarella, grated
• 2 garlic cloves, crushed
• 2 courgettes, grated
• 2 carrots, grated
• 2 celery sticks, grated
• 1 tbsp chopped thyme
• 680g passata
• 300ml vegetable stock
• 1 tbsp balsamic vinegar
• 50g butter
• 50g plain flour
• 600ml milk
• 2 bay leaves (optional)
• ½ cauliflower, cut into very small florets, stalk cut into small cubes