Next level moussaka

Name: Next-level moussaka
Ingredients: 100ml olive oil; 500g lamb mince; 1 onion, finely chopped; 3 large garlic cloves, crushed; ½ tsp light brown soft sugar; 2 tbsp tomato purée; 2 tbsp red wine vinegar; 400g can chopped tomatoes; 200ml red wine; 1 tbsp dried oregano; 1 cinnamon stick; 2 bay leaves; 3 aubergines; mixed salad leaves, to serve; 500ml Greek yogurt; 1 egg, plus 1 yolk, lightly beaten (freeze the white for another recipe); 50g parmesan, grated; pinch of grated nutmeg; 100g feta, crumbled