Classic Italian lasagne - Good Food Middle East

Ingredients

• 250g pack fresh lasagne sheets
• olive oil, for greasing
• large handful grated Parmesan
• 110g unsalted butter
• 1 celery stick, finely chopped
• 1 carrot, finely chopped
• 1 small red onion, finely chopped
• 25g dried porcini, soaked for 10 mins in hot water, drained and roughly chopped
• 1 rosemary sprig, leaves picked and chopped
• 1kg trimmed beef or veal flank, finely chopped (ask your butcher to do this for you)
• 125ml dry white wine
• 400g can good-quality chopped tomatoes
• 1l full-fat milk
• 1 bay leaf
• 75g unsalted butter
• 125g ‘00’ pasta flour
• good grating of nutmeg
• 100g Parmesan, finely grated
• 2 egg yolks