Mix together the ingredients for the cucumber mint mocktail. Refrigerate until ready to serve.
Preheat oven to 450° F (240° C).
Prep eggplant: Place eggplant slightly overlapping in a large colander. Sprinkle with some salt. Repeat with remaining eggplant. Leave to sweat for 30 minutes. See notes. While sweating, prep ingredients and make Meat Sauce.
Prep onion and garlic for meat sauce per instruction above.
Make meat sauce: Heat olive oil in a large skillet or pot over high heat. Add the garlic and onion and cook for 2 minutes. Add the beef and cook until browned, using a spatula to break it up as you go. Add wine, cook for 2 minutes or until the alcohol smell is gone. Add remaining ingredients and stir to combine. Bring to a simmer, then lower heat to medium low and cook for 15 minutes, or until reduced to a thick sauce.
Bake eggplant for 15 - 20 minutes or until lightly browned and softened. While baking, make bechamel sauce.
Make bechamel sauce: Melt butter in a pan over medium heat. Add flour and cook for 1 minute, stirring constantly. Continue stirring constantly while slowly adding the milk. Cook, stirring regularly, for another 3 to 5 minutes or until thickened enough to coat the back of a wooden spoon. Remove from the heat and whisk in cheese, nutmeg, and a pinch of salt and pepper. Allow to cool for 5 minutes. Cover with lid and set aside.
Once the eggplant is cooked, remove from oven and set aside to cool slightly
Lower oven to 350°F (180° C).
Assemble Moussaka: Layer the eggplant in the bottom of an appropriately sized baking dish or oven-safe container, then cover with all of the Meat Sauce. Top with remaining eggplant, then pour over the Béchamel Sauce and sprinkle the top with breadcrumbs.
Bake for 30 - 40 minutes or until golden brown. Let sit for 10 minutes.
Drizzle bread with oil and season with oregano. Toast until golden brown.
Serve: Enjoy the moussaka with bread and cucumber mocktail.Portion and save any remaining for future use.