Greek Moussaka with Eggplant and Feta

Name: Greek Moussaka with Eggplant and Feta
Ingredients: 400 grams eggplant; Salt; 4 tablespoons Olive oil; 2 Onions; 3 Tomatoes; 400 grams Ground beef; 100 milliliters dry White wine; 1 generous pinch Sugar; 1 pinch Cinnamon; freshly ground Pepper; ½ teaspoon dried Oregano; 3 sprigs Parsley; 40 grams Breadcrumbs; 60 grams freshly grated Graviera cheese (or Gruyère); 2 tablespoons Butter; 2 tablespoons Pastry flour; 400 milliliters Milk; freshly grated Nutmeg; 2 teaspoons Lemon juice; 1 Egg; 100 grams soft Feta cheese