Classic Curly Lasagna - San Remo

Ingredients

• 2 packets San Remo Curly Lasagna 250g
• 2 tbsp olive oil
• 2 brown onions, finely diced
• 2 carrots, finely diced
• 2 celery sticks, finely diced
• 2 garlic, finely chopped
• 800g beef mince
• 750ml passata
• 400g tinned cherry tomatoes
• 2 bay leaves
• Salt and pepper, to taste
• 50g butter
• 50g flour
• 750ml milk
• 200g mozzarella
• 100g grated Parmesan