Moussaka

Name: Moussaka
Ingredients: 6 tbsp olive oil; 3 medium aubergines, cut into 5mm rounds; 800g lamb mince; 1 onion, finely chopped; 2 fat garlic cloves, crushed; 3 heaped tsp dried oregano; 2 tsp ground cinnamon; 2 bay leaves; 200ml red wine; 400g can chopped tomatoes; 2 tbsp tomato purée; ½ tbsp light brown soft sugar; 550g Maris Piper potatoes, peeled and sliced into 5mm rounds; 40g unsalted butter; 40g plain flour; 450ml whole milk; 40g parmesan, finely grated; whole nutmeg, for grating; 1 large egg plus 1 yolk, lightly beaten