• 2 aubergines (cut into 1cm slices)
• 1 Tbsp fine sea salt
• 750g lamb mince
• 1 onion, finely chopped
• 2 garlic cloves (crushed)
• 1 tsp dried oregano
• 1½ tsp dried mint
• 1 bay leaf
• 1 cinnamon stick
• 1 Tbsp plain flour
• ½ tsp flaked sea salt, plus extra for seasoning
• 200ml red wine
• 400g chopped tomatoes
• 2 Tbsp tomato purée
• 100ml olive oil
• 500g potatoes (peeled and cut into 1cm slices)

For the white sauce

• 50g butter
• 50g plain flour
• 400ml milk
• 1 tsp nutmeg (grated)
• 25g Parmesan (finely grated)
• 1 egg (beaten)