Prepare Vegetables: Fry potatoes and aubergines in a pan with olive oil or in an air fryer until golden and delicious.
Make Meat Sauce: Sauté minced lamb, then add onions, garlic, bay leaves, black pepper, tomato purée, allspice, cinnamon, canned tomatoes, and water in the order listed. Simmer on low heat for 20-30 minutes.
Prepare Bechamel Sauce: Make a roux with flour, then gradually add milk and cream. Stir in grated cheese and season with salt and nutmeg.
Assemble Moussaka: Layer the dish in a baking tray, starting with vegetables, then meat sauce, and top with bechamel sauce.
Bake: Bake in a preheated oven at 185°C (365°F) with fan for 20-30 minutes until golden and bubbly.