Lighter lasagne with aubergine pasta

Ingredients

• 1 aubergine (about 350g), trimmed, then cut lengthways into ½cm slices
• Light cooking oil spray
• 1 onion, diced
• 1 stick celery, finely sliced
• 1–2 cloves garlic, finely diced
• 2 medium carrots, finely diced
• 250g beef mince, 5% fat
• 250g turkey mince, 2% fat
• ¼ teaspoon smoked paprika (optional)
• 1 reduced-salt beef stock cube, crumbled
• 1 x 400g can chopped tomatoes
• 1 tablespoon tomato purée
• ½ teaspoon dried oregano
• Small handful fresh basil leaves
• 270ml skimmed milk
• 1 tablespoon cornflour, mixed into a smooth paste with 2 tablespoons skimmed milk
• 80g half-fat mature Cheddar cheese, grated
• ¼ teaspoon freshly ground nutmeg