To make moussaka, cut and roast the vegetables. Prepare the meaty tomato sauce and let it simmer. Next, prepare the bechamel sauce with butter, milk, flour, cheese, and spices. Layer the vegetables, meat sauce, and vegetables again in a rectangular baking dish. Top with the bechamel sauce and bake at 375 degrees Fahrenheit for 45 minutes to 1 hour until the top is golden brown.