BEEF AND LENTIL MOUSSAKA

Name: BEEF AND LENTIL MOUSSAKA
Ingredients: 500 grams minced beef; 1/3 cup dried brown lentils; 1 large aubergine; 2 medium onions, chopped; 4 large tomatoes (or 1 tin); 2 tbsp tomato purée; 3 cloves of garlic, finely chopped; 1 1/4 tsp dried oregano; 1 tsp chilli powder; 1/2 tsp paprika; 1/4 tsp ground cinnamon; 1/2 cup red wine; 3 tbsp oil (plus 1 tbsp for the aubergines); Freshly grated black pepper; Salt, to taste; For the béchamel:; 40 grams unsalted butter; 2 tbsp flour; 1 cup milk (you might need more); 1/8 tsp grated nutmeg; 25 grams grated parmesan