Greek Ground Meat and Vegetable Moussaka

Name: Greek Ground Meat and Vegetable Moussaka
Ingredients: 2 eggplants; Salt; Olive oil (for cooking); 1 Onion; 4 Tomatoes; 500 grams Ground meat (Beef or lamb); 250 milliliters dry White wine; 1 pinch Sugar; freshly ground Pepper; ½ teaspoon Ground cinnamon; 1 teaspoon dried Oregano; 100 grams Hard cheese (Gruyere or Kefalotiri); 3 Eggs; 4 tablespoons Breadcrumbs; 40 grams Butter (and butter for the pan); 4 tablespoons Pastry flour; 750 milliliters Milk; 2 Eggs; freshly grated Nutmeg; 1 teaspoon Lemon juice